[4.x] Fix error from static caching invalidator when deleting entries #9191
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This pull request attempts to fix an issue from the Static Caching invalidator when deleting entries in a structured collection.
When you have a structured collection, the invalidation logic would attempt to get the entry's URL but in doing so it called a method on an entry which no longer existed.
This PR changes when invalidation happens for entries. Instead of it happening after the entry has been deleted (& removed from the tree), it'll happen before the entry is deleted and removed from the tree so the full entry URI is known and to prevent the error from happening.
Fixes #5836.