Entity matching pipeline hardening, observability, and cleanup

[BergsethCognite]

• Fixed runtime bug in read_manual_mappings (early-return shape mismatch crashed pipelines without the manual mapping table) and corrected its return-type annotation
• Replaced boolean filter checks with is not None to silence the SDK UserWarning and match its documented contract
• Made the Mixpanel usage tracker truly best-effort (daemon=True + try/except inside the thread body)
• Dropped redundant patch_existing_pipeline() call from run_locally
• Lazy-imported RawUploadQueue so pipeline.py is testable without cognite-extractor-utils
• Wired pipeline_optimizations helpers into production: pre-compiled rule regexes, RobustAPIClient retry around all 9 instances.apply sites, time_operation per major phase, monitor_memory_usage + cleanup_memory at phase boundaries
• Slimmed pipeline_optimizations.py and test_optimizations.py (~60% smaller) — kept only the 6 helpers actually used in production
• Fixed pre-existing test_handler.py rot (stale asset_entity_matching patch targets, drifted constants, over-strict assertions): now 11/11 passing instead of 1/11
• Rewrote the function README's Testing section (run commands, prerequisites, what's covered) and updated the helpers/advanced-usage sections to match reality
• All 16 tests passing, lint clean, no warnings

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