Dont enqueue Editor script (sidebar) for all users

[ilicfilip]

Currently we add PP Sidebar to all edit screens and for all users, which is wrong.

This PR adds a check so it is only loaded for users who have edit_others_posts cap.

Also it adds a check so sidebar is only added to the Page edit screen, but.. I am not sure about it. We have Blog page type:

And I am not sure if this should be assigned to all Blog posts.. or we should remove it?

On settings page we had: Home, About, Contact and FAQ

cc @jdevalk

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✅ Code Coverage Report

Metric	Value
Total Coverage	31.48% 📉
Base Coverage	31.49%
Difference	📉 -0.01%

⚠️ Coverage below recommended 40% threshold

📊 File-level Coverage Changes (1 files)

📉 Coverage Decreased

Class	Before	After	Change
Progress_Planner\Admin\Editor	3.85%	3.57%	-0.28%

ℹ️ About this report

• All tests run in a single job with Xdebug coverage
• Security tests excluded from coverage to prevent output issues
• Coverage calculated from line coverage percentages