env: maintain tracked page identifier cache between builds #1079
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When a cache is kept for tracking previously published pages and their identifiers, if a processing event results in pages not needing to be updated, unchanged pages can cause their page identifiers to be removed from the active list. This can result in a following pass to cleanup legacy-flagged pages for pages that are still considered unchanged.
The cache implementation should be maintaining the assumed cached identifier for pages if they remain changed for a run. Updating the implementation to always populate the cached page identifiers before replacing them with new active page identifiers (if any).