[BUGFIX:P:13] Fix mount point garbage collection #4328
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What this pr does
EXT:solr failed to delete indexed mounted pages if a mount point is deleted or deactivated, this issue is fixed by extending the PageStrategy.
Additionally it's ensured, that changes to the slug of a mount page triggers a reindexing of the mounted pages as the indexed slug has become invalid.
Ports: #4315
Resolves: #4314