[WIP] Fix inconsistency between dashboard detection percentage and inject detail page

[Copilot]

• V5_35 migration: add indexing_last_id column to indexing_status
• IndexingStatus entity: add lastId field
• InjectExpectationRepository: add findForIndexingAfter(from, lastId, limit) compound-cursor query
• Handler interface: add default fetch(from, lastId, limit) method
• InjectExpectationHandler: extract mapping helper, override fetch(from, lastId, limit) to use compound cursor
• ElasticService: track lastId per cycle in bulkProcessing
• OpenSearchService: track lastId per cycle in bulkProcessing
• Add integration test for compound-cursor behaviour in IndexingRegressionTest

[Seb-MIGUEL]

Superseded by PR #6493 which implements the same fix from a clean main-based branch.