Content query: sync the fixes from the core PR review

[jorgefilipecosta]

What?

Follow up to WordPress/wordpress-develop#12195.

Brings the fixes from the review of the core core/content-query PR to the plugin's copy of the ability.

Why?

The plugin's Content class is kept almost identical to core's WP_Content_Abilities, so both copies should get the same fixes.

How?

• The "This filter is documented in" references sit directly above their apply_filters() calls, without a trailing period. The NonPrefixedHooknameFound ignores move to the end of the apply_filters() lines.
• The count query in get_query_total() unsets no_found_rows, so it can't skip the count it exists for. The main query doesn't set it today, so this is defensive.
• Comments that span more than one line use the /* */ format.
• ContentTest no longer pops the faked abilities init actions in try/finally blocks, since WP_UnitTestCase restores $wp_current_filter in tear_down().
• The class docblock drops the note that core's class is still static. Core's class is final and instance-based now, like the plugin's.

Left out are the core-only test changes (Trac @ticket tags, REST controller test messages, relying on core's per-test post type reset) and the public meta flag, which is a separate change.

Use of AI Tools

Ported from the core PR with AI assistance (Claude Code) and reviewed by me.

Testing Instructions

Run the content ability tests:

npm run test:php -- --filter ContentTest

Changelog Entry

Developer - Sync the core/content-query ability with the fixes from its core review.

[github-actions]

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Co-authored-by: jorgefilipecosta <jorgefilipecosta@git.wordpress.org>
Co-authored-by: dkotter <dkotter@git.wordpress.org>

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[github-actions]

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✅ Status: Passed

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.62%. Comparing base (2cc9603) to head (8f6208f).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #1123   +/-   ##
==========================================
  Coverage      81.62%   81.62%           
  Complexity      3088     3088           
==========================================
  Files            129      129           
  Lines          12297    12297           
==========================================
  Hits           10037    10037           
  Misses          2260     2260           

Flag	Coverage Δ
unit	81.62% <100.00%> (ø)

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