[!!!][TASK] Rework frontend indexing helpers #3674
Merged
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This change cleans up a few parts within the FrontendHelper logic when indexing a page in the frontend:
The PageIndexerInitialization and PageIndexerFinisher middleware are now merged.
The PageIndexerRequestHandler contains no state
The PageIndexerRequest is added to the PSR-7 Request as attribute "solr.pageIndexingInstructions" so it can be retrieved in various places.
The AbstractFrontendHelper is removed, as the FrontendHelper middleware is thinned out. Activation and Deactivation rather works as initialization and flushing
This allows us to use DI in various places we hadn't had a chance before.
In addition, the AuthorizationService getGroupsFE is removed as it has been already replaced by a PSR-14 event.