[TEST ONLY] RTC: Discard stale compactions when a newer one already exists#77990

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fix/rtc-polling-sync-tests

Commits on May 6, 2026

Refactor WP_HTTP_Polling_Sync_Server behavior to discard overlapping updates silently. Update collaboration.php to conditionally use Gutenberg-specific sync server and adjust REST route registratio…
ramonjd
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Remove WP_HTTP_Polling_Sync_Server class and update collaboration.php to exclusively use Gutenberg-specific sync server. Adjust tests to reference the new class structure.
ramonjd
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