Improve: Remove legacy help support screen

[RabbiIslamRony]

PR Type

What kind of change does this PR introduce?

• Bugfix
• Security fix
• Improvement
• New Feature
• Refactoring (no functional changes, no api changes)
• Build related changes
• Text changes
• Other... Please describe:

Description

This PR removes the old Help & Support / System Status
admin flow that was previously deleted at the screen
level but still had leftover references in the
codebase.

What changed

• Removed stale admin screen handling for the deleted
  support page in includes/asset-loader/helper.php.
• Removed support-page asset enqueue logic in
  includes/asset-loader/init.php.
• Removed the old updater notice screen ID reference
  in includes/classes/class-updater-notice.php.
• Removed support-page JS handlers for:
  • sending system info
  • generating a remote support URL
  • revoking a remote support URL
  • the obsolete support-tab switching logic
• Removed the related support-page SCSS/CSS styling
  from the admin stylesheet.
• Updated the compiled admin assets so the shipped
  bundles match the source cleanup:
  • assets/js/admin-main.min.js
  • assets/css/admin-main.min.css
  • assets/css/admin-main.rtl.min.css

Why

• The Help & Support / System Status screen was
  already removed, but several references still
  pointed to it.
• Leaving those references behind creates dead code,
  stale admin behavior, and maintenance risk.
• Removing them fully keeps the codebase consistent
  and avoids confusion in asset loading and admin UI
  logic.

Impact

• Normal plugin functionality remains unchanged.
• The removed support workflow no longer exists, which
  is expected because the page itself is gone.
• Admin assets are now aligned with the current screen
  structure.

Verification

• Confirmed there are no remaining matches for the
  removed support-specific identifiers in the source/
  admin asset code.
• Verified the updated source and compiled bundles are
  consistent.

Any linked issues

Fixes #

Checklist

• My code follows the WordPress coding standards