When a theme is updated, raise a ThemeUpdated event #5731
Merged
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As part of the on-going work with the new Search functionality, we need to signal whenever anything changes that affects the data that is stored and indexed by the search indexer.
The Searchable Document representation of a Release Version contains some Theme information. Therefore, if a Theme changes, we need to update any Searchable Documents that are a part of that Theme.
In this PR, we are raising an event when a Theme is updated. A future piece of work will subscribe to that event, look up the publications and therefore release versions that fall under that theme, and have the corresponding Searchable Documents updated.