Apply enabled/stock default filters on the incremental indexing path

[loevgaard]

What

Full reindexing and incremental (Doctrine event) indexing used two different, inconsistent filter sets. The enabled / stock_available default filters only existed as query-builder subscribers (which run during full reindex), while the incremental path only ran the object filters tagged setono_sylius_meilisearch.entity_filter — of which only channels_aware had an object-filter counterpart. Consequences:

• editing a disabled product re-added it to the index;
• disabling a product didn't remove it (nothing on the incremental path ever deleted).

Two parts:

1. Unify the filters. Ship EnabledEntityFilter and StockAvailableEntityFilter (the object-filter counterparts of the enabled / stock_available query-builder subscribers), registered under the same per-index default_filters toggles as the subscribers — so the incremental path applies the same rules as the full reindex.
2. Delete on filter failure. In DefaultIndexer::indexEntities(), when an entity fails the object filter, its document is removed from that scope's index (batched per scope) instead of being silently skipped. So "disable a product" (or de-stock it) actively removes it from search on the very next save.

Full reindex already routes through indexEntities, but its entities are pre-filtered by the query-builder subscribers, so the object filters are consistent and no spurious deletes occur (verified: the functional SearchTest still passes).

Testing

• EnabledEntityFilterTest / StockAvailableEntityFilterTest: full logic incl. other-index scopes, non-toggleable/non-product entities, untracked vs out-of-stock variants, no-variant products.
• DefaultIndexerTest::it_removes_a_filtered_out_entity_from_the_index: a filtered-out entity triggers deleteDocuments([id]).

Closes #112

---

Stacked on #156 (#111).

[codecov]

Codecov Report

❌ Patch coverage is 82.05128% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.72%. Comparing base (00d3831) to head (be49d96).

Files with missing lines	Patch %	Lines
...encyInjection/SetonoSyliusMeilisearchExtension.php	50.00%	4 Missing ⚠️
src/Filter/Entity/StockAvailableEntityFilter.php	78.57%	3 Missing ⚠️

Additional details and impacted files

@@                          Coverage Diff                           @@
##             issue-111-remove-entity-document     #157      +/-   ##
======================================================================
+ Coverage                               45.17%   45.72%   +0.54%     
- Complexity                                734      748      +14     
======================================================================
  Files                                     131      133       +2     
  Lines                                    2406     2443      +37     
======================================================================
+ Hits                                     1087     1117      +30     
- Misses                                   1319     1326       +7     

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