Add progress validation command

[m1r0]

Resolves #7079

Proposed Changes

• Add a WP CLI command that validates the migrated progress data.
• Fixes quiz progress not migrating when multiple users have progress on the same quiz.

Testing Instructions

1. Enable the HPPS feature add_filter( 'sensei_feature_flag_tables_based_progress', '__return_true' );.
2. Run the student progress migration following the testing instructions at Add student progress migration #7049.
3. Run the following command in your WordPress folder: wp sensei validate progress.
4. You should see Success: Progress data is valid..
5. Try deleting a progress entry in your wp_sensei_lms_progress table.
6. You should see a Course/Lesson/Quiz tables based progress not found error.
7. Try changing the progress status in your wp_sensei_lms_progress table.
8. You should see a Data mismatch between comments and tables based progress. error.

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
• 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

[codecov]

Codecov Report

Merging #7160 (f93f87f) into trunk (feef998) will increase coverage by 0.22%.
Report is 99 commits behind head on trunk.
The diff coverage is 53.38%.

@@             Coverage Diff              @@
##              trunk    #7160      +/-   ##
============================================
+ Coverage     50.31%   50.53%   +0.22%     
- Complexity    10862    10932      +70     
============================================
  Files           601      607       +6     
  Lines         45675    46149     +474     
  Branches        402      402              
============================================
+ Hits          22980    23322     +342     
- Misses        22368    22500     +132     
  Partials        327      327              

Files	Coverage Δ
includes/admin/class-sensei-admin-notices.php	50.86% <ø> (ø)
includes/admin/class-sensei-learner-management.php	4.20% <ø> (ø)
...-sensei-learners-admin-bulk-actions-controller.php	40.12% <ø> (ø)
.../class-sensei-learners-admin-bulk-actions-view.php	55.47% <ø> (ø)
includes/admin/class-sensei-learners-main.php	5.30% <ø> (ø)
includes/admin/class-sensei-tools.php	21.49% <ø> (ø)
...s/admin/home/class-sensei-home-remote-data-api.php	95.52% <ø> (ø)
...dmin/home/help/class-sensei-home-help-provider.php	97.43% <ø> (ø)
...ome/notices/class-sensei-home-notices-provider.php	100.00% <ø> (ø)
...s/admin/home/notices/class-sensei-home-notices.php	90.98% <ø> (ø)
... and 89 more

... and 13 files with indirect coverage changes

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[merkushin]

Looks good. Works as expected :)

I left a few optional suggestions.