Remove pypdf3 backwards compatibility about pdfconduit HOT 1 CLOSED

TestEncrypt.test_encrypt_128bit                    --> mms: 146.56
.TestEncrypt.test_encrypt_128bit_allow_commenting   --> mms: 64.84
.TestEncrypt.test_encrypt_128bit_allow_printing     --> mms: 70.15
.TestEncrypt.test_encrypt_128bit_allow_printing_and_commenting --> mms: 94.08
.TestEncrypt.test_encrypt_40bit                     --> mms: 62.04
.TestEncrypt.test_encrypt_40bit_allow_commenting    --> mms: 80.00
.TestEncrypt.test_encrypt_40bit_allow_printing      --> mms: 72.98
.TestEncrypt.test_encrypt_40bit_allow_printing_and_commenting --> mms: 70.69
.TestEncrypt.test_encrypted_pdf_has_metadata        --> mms: 73.62
.TestEncrypt.test_password_byte_string              --> mms: 101.07
.TestWatermark.test_conduit_watermark_flat_pdfrw    --> mms: 762.33
.TestWatermark.test_conduit_watermark_flat_pypdf    --> mms: 450.64
.TestWatermark.test_conduit_watermark_flat_pypdf3   --> mms: 418.15
.TestWatermark.test_conduit_watermark_label         --> mms: 48.28
.TestWatermark.test_conduit_watermark_layered_pdfrw --> mms: 226.97
.TestWatermark.test_conduit_watermark_layered_pypdf --> mms: 242.07
.TestWatermark.test_conduit_watermark_layered_pypdf3 --> mms: 255.62
.TestWatermark.test_conduit_watermark_overlay_pdfrw --> mms: 253.87
.TestWatermark.test_conduit_watermark_overlay_pypdf --> mms: 251.76
.TestWatermark.test_conduit_watermark_overlay_pypdf3 --> mms: 258.34
.TestWatermark.test_conduit_watermark_pdfrw         --> mms: 221.35
.TestWatermark.test_conduit_watermark_pypdf         --> mms: 245.52
.TestWatermark.test_conduit_watermark_pypdf3        --> mms: 254.45
.TestWatermark.test_conduit_watermark_underneath_pdfrw --> mms: 220.50
.TestWatermark.test_conduit_watermark_underneath_pypdf --> mms: 242.03
.TestWatermark.test_conduit_watermark_underneath_pypdf3 --> mms: 266.83
.TestFlatten.test_flatten                           --> sec: 2.76
.TestImg2Pdf.test_convert                           --> sec: 1.31
.TestImg2Pdf.test_convert_packet                    --> sec: 4.01
.TestPdf2Img.test_pdf2img                           --> mms: 213.68
.TestMerge.test_merge_pdfrw                         --> mms: 131.47
.TestMerge.test_merge_pypdf                         --> mms: 419.95
.TestMerge.test_merge_pypdf3                        --> mms: 304.76
.TestRotate.test_rotate_pdfrw_180                   --> mms: 15.49
.TestRotate.test_rotate_pdfrw_270                   --> mms: 16.50
.TestRotate.test_rotate_pdfrw_90                    --> mms: 17.24
.TestRotate.test_rotate_pypdf3_180                  --> mms: 27.15
.TestRotate.test_rotate_pypdf3_270                  --> mms: 25.09
.TestRotate.test_rotate_pypdf3_90                   --> mms: 25.47
.TestRotate.test_rotate_pypdf_180                   --> mms: 31.28
.TestRotate.test_rotate_pypdf_270                   --> mms: 34.45
.TestRotate.test_rotate_pypdf_90                    --> mms: 31.04
.TestSlice.test_slice_pypdf3_4th_through_7th_pages  --> mms: 21.23
.TestSlice.test_slice_pypdf3_only_first_page        --> mms: 16.45
.TestSlice.test_slice_pypdf_4th_through_7th_pages   --> mms: 66.12
.TestSlice.test_slice_pypdf_only_first_page         --> mms: 22.79
.TestUpscale.test_downscale_pdfrw_20x               --> mms: 30.86
.TestUpscale.test_downscale_pypdf3_20x              --> sec: 4.97
.TestUpscale.test_downscale_pypdf_20x               --> sec: 1.49
.TestUpscale.test_upscale_pdfrw_15x                 --> mms: 35.33
.TestUpscale.test_upscale_pdfrw_20x                 --> mms: 36.12
.TestUpscale.test_upscale_pdfrw_30x                 --> mms: 35.79
.TestUpscale.test_upscale_pypdf3_15x                --> sec: 5.09
.TestUpscale.test_upscale_pypdf3_20x                --> sec: 4.87
.TestUpscale.test_upscale_pypdf3_30x                --> sec: 4.84
.TestUpscale.test_upscale_pypdf_15x                 --> sec: 1.53
.TestUpscale.test_upscale_pypdf_20x                 --> sec: 1.49
.TestUpscale.test_upscale_pypdf_30x                 --> sec: 1.49
.TestInfoPypdf.test_pypdf3_dimensions               --> mms: 0.78
.TestInfoPypdf.test_pypdf3_is_decrypted             --> mms: 0.46
.TestInfoPypdf.test_pypdf3_is_encrypted             --> mms: 4.58
.TestInfoPypdf.test_pypdf3_is_not_decrypted         --> mms: 4.16
.TestInfoPypdf.test_pypdf3_is_not_encrypted         --> mms: 0.54
.TestInfoPypdf.test_pypdf3_metadata                 --> mms: 0.58
.TestInfoPypdf.test_pypdf3_pages                    --> mms: 2.90
.TestInfoPypdf.test_pypdf3_resources                --> mms: 0.69
.TestInfoPypdf.test_pypdf3_rotate_no_rotation       --> mms: 0.62
.TestInfoPypdf.test_pypdf3_rotate_rotated           --> mms: 2.20
.TestInfoPypdf.test_pypdf3_security_decrypted_pdf   --> mms: 5.66
.TestInfoPypdf.test_pypdf3_security_encrypted_pdf   --> mms: 3.71
.TestInfoPypdf.test_pypdf3_security_passwordless_pdf --> mms: 0.45
.TestInfoPypdf.test_pypdf3_size                     --> mms: 0.85
.TestInfoPypdf.test_pypdf3_size_and_dimensions_are_equal --> mms: 0.64
.TestInfoPypdf3.test_pypdf3_dimensions              --> mms: 0.58
.TestInfoPypdf3.test_pypdf3_is_decrypted            --> mms: 0.32
.TestInfoPypdf3.test_pypdf3_is_encrypted            --> mms: 0.46
.TestInfoPypdf3.test_pypdf3_is_not_decrypted        --> mms: 0.46
.TestInfoPypdf3.test_pypdf3_is_not_encrypted        --> mms: 0.37
.TestInfoPypdf3.test_pypdf3_metadata                --> mms: 0.51
.TestInfoPypdf3.test_pypdf3_pages                   --> mms: 2.16
.TestInfoPypdf3.test_pypdf3_resources               --> mms: 0.67
.TestInfoPypdf3.test_pypdf3_rotate_no_rotation      --> mms: 0.75
.TestInfoPypdf3.test_pypdf3_rotate_rotated          --> mms: 2.21
.TestInfoPypdf3.test_pypdf3_security_decrypted_pdf  --> mms: 7.29
.TestInfoPypdf3.test_pypdf3_security_encrypted_pdf  --> mms: 0.55
.TestInfoPypdf3.test_pypdf3_security_passwordless_pdf --> mms: 0.40
.TestInfoPypdf3.test_pypdf3_size                    --> mms: 0.77
.TestInfoPypdf3.test_pypdf3_size_and_dimensions_are_equal --> mms: 0.58
.TestPath.test_add_suffix                           --> mms: 0.06
.TestPath.test_add_suffix_suffix                    --> mms: 0.04
.TestPath.test_add_suffix_suffix_sep                --> mms: 0.03
.TestPath.test_add_suffix_suffix_sep_ext            --> mms: 0.04
.TestRead.test_pypdf3_reader_can_read_encrypted_with_password --> mms: 16.04
.TestRead.test_pypdf3_reader_can_read_unencrypted   --> mms: 2.52
.TestRead.test_pypdf3_reader_cant_read_encrypted    --> mms: 7.49
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