Use bulk_edit_posts hook for bulk edit handler

[merkushin]

This PR addresses the issue with performance degradation, noticed here: #7523 (review).

Proposed Changes

• Use bulk_edit_posts hook for bulk edit handler.

Testing Instructions

1. Create a few courses with lessons.
2. Go to lessons and use bulk edit to update lesson course and complexity, for example.
3. Make sure the changes were applied to selected lessons.
4. Make sure Quick Edit works as well.

Pre-Merge Checklist

• PR title and description contain sufficient detail and accurately describe the changes
• Acceptance criteria is met
• Decisions are publicly documented
• Adheres to coding standards (PHP, JavaScript, CSS, HTML)
• All strings are translatable (without concatenation, handles plurals)
• Follows our naming conventions (P6rkRX-4oA-p2)
• Hooks (p6rkRX-1uS-p2) and functions are documented
• New UIs are responsive and use a mobile-first approach
• New UIs match the designs
• Different user privileges (admin, teacher, subscriber) are tested as appropriate
• Legacy courses (course without blocks) are tested
• Code is tested on the minimum supported PHP and WordPress versions
• User interface changes have been tested on the latest versions of Chrome, Firefox and Safari
• "Needs Documentation" label is added if this change requires updates to documentation
• Known issues are created as new GitHub issues

[github-actions]

Test the previous changes of this PR with WordPress Playground.

[codecov]

Codecov Report

Attention: Patch coverage is 96.42857% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 51.93%. Comparing base (9c9bcae) to head (7ab9b3c).
Report is 22 commits behind head on trunk.

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk    #7526      +/-   ##
============================================
- Coverage     51.93%   51.93%   -0.01%     
- Complexity    11267    11268       +1     
============================================
  Files           630      630              
  Lines         47665    47666       +1     
  Branches        420      420              
============================================
  Hits          24756    24756              
- Misses        22572    22573       +1     
  Partials        337      337              

Files	Coverage Δ
includes/class-sensei-lesson.php	37.12% <96.42%> (-0.02%)	⬇️

... and 1 file with indirect coverage changes

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[Imran92]

Thanks for making the change @merkushin ! Looks like bulk_edit_posts was introduced in WP 6.3.. I was wondering if we should wait until 6.3 becomes are minimum required version (25th of this month probably) or should conditionally handle it differently for lower versions (like keeping it working with save_post but detaching the hook after first call). WDYT?

[merkushin]

@Imran92 I think it is better to add a backward-compatibility version 👍 And it shouldn't be too hard (actually, that was one of my interim versions, but I removed it as I didn't find it useful 😅).

[github-actions]

Test the previous changes of this PR with WordPress Playground.

[github-actions]

Test the previous changes of this PR with WordPress Playground.

[github-actions]

Test the previous changes of this PR with WordPress Playground.

[Imran92]

LGTM 👍

[Imran92]

Typo in the word 'backward'

[github-actions]

Test the previous changes of this PR with WordPress Playground.