Enhance search doc: TrashService references, LocationList::getTotalCount()

[adriendupuis]

Question	Answer
JIRA Ticket	N/A
Versions	4.6, master
Edition	All

• Repository filtering: Use LocationList::getTotalCount() instead of LocationList::$totalCount (see this getter addition circa v4.2.3)
  • https://doc.ibexa.co/en/latest/search/search_api/#repository-filtering
  • https://ez-systems-developer-documentation--2540.com.readthedocs.build/en/2540/search/search_api/#repository-filtering
• Most of TrashService::findTrashItems criteria and sort clauses are to be also used with SearchService and Repository Filtering.
  • Rework trash search reference's intro. Quote DateMetadata::TRASHED.
    • https://doc.ibexa.co/en/latest/search/search_in_trash_reference/
    • https://ez-systems-developer-documentation--2540.com.readthedocs.build/en/2540/search/search_in_trash_reference/
  • Add a "Trash" column to search criteria reference table to highlight are shared.
    • https://doc.ibexa.co/en/latest/search/criteria_reference/search_criteria_reference/#search-criteria
    • https://ez-systems-developer-documentation--2540.com.readthedocs.build/en/2540/search/criteria_reference/search_criteria_reference/#search-criteria
  • Idem with sort clauses reference
    • https://doc.ibexa.co/en/latest/search/sort_clause_reference/sort_clause_reference/#sort-clauses
    • https://ez-systems-developer-documentation--2540.com.readthedocs.build/en/2540/search/sort_clause_reference/sort_clause_reference/#sort-clauses

Checklist

• Text renders correctly
• Text has been checked with vale
• Description metadata is up to date
• Redirects cover removed/moved pages
• Code samples are working
• PHP code samples have been fixed with PHP CS fixer
• Added link to this PR in relevant JIRA ticket or code PR