Fix wrong hook constants in read transcribe hooks and add read hook test

[hasielhassan]

Link the Issue(s) this Pull Request is related to.

N/A — found while trying to use the hooks and reviewing the hooks module.

Summarize your change.

run_pre_read_transcribe_hook and run_post_read_transcribe_hook in hooks.py were using HOOK_PRE_WRITE_TRANSCRIBE / HOOK_POST_WRITE_TRANSCRIBE instead of their READ counterparts. This meant the read hooks would never fire correctly.

Changes:

• Fixed the condition in run_pre_read_transcribe_hook
• Fixed the condition and otio.hooks.run call in run_post_read_transcribe_hook
• Renamed test_transcribe_hook_args_map to test_transcribe_write_hook_args_map for clarity
• Added test_transcribe_read_hook_args_map to cover the read hook path

Reference associated tests.

• test_transcribe_read_hook_args_map — new test that validates both pre and post read hooks fire correctly using the existing hooks_plugin_example plugin
• test_transcribe_write_hook_args_map — existing test (renamed), still covers the write path
• test_transcribe_hooks_registry — existing test, unchanged

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: hasielhassan / name: Hasiel Alvarez (24d46a2)

[timlehr]

Thanks @hasielhassan! That's an embarrassing oversight in my code haha. There is an issue with the CIs using the latest OTIO main, but once that is resolved, I should be able to merge this.