Add config for dimension table upsert

[xiangfu0]

Motivation

• Provide a config toggle to enable or disable dimension-table upsert/dedup logic so clusters can opt into queryable-doc-id filtering and upsert behavior for dimension tables.
• Ensure upsert-related processing (computing/applying per-segment queryable doc id bitmaps and enabling segment upsert state) is only performed when the feature is explicitly enabled.

Description

• Added an enableUpsert boolean to DimensionTableConfig (JSON property enableUpsert) and exposed isUpsertEnabled() in pinot-spi.
• Read the new flag in DimensionTableDataManager and gate upsert-related logic behind _enableUpsert, including using queryable-doc-id snapshots when sizing/iterating segments and applying per-segment bitmaps.
• Introduced a small RecordLocation type and helper methods applyQueryableDocIdsForRecordLocations, applyQueryableDocIdsForLookupTable, applyQueryableDocIdsToSegments, and getQueryableDocIdsSnapshot in DimensionTableDataManager to compute and apply per-segment MutableRoaringBitmap sets and call ImmutableSegmentImpl.enableUpsert(...) when appropriate.
• Updated all test and helper call sites that construct DimensionTableConfig to pass the new flag, and added integration coverage that creates a small OFFLINE upsert dimension table and asserts deduplicated selection/count results (testDimensionTableUpsertSelection), as well as a unit test testLookupRespectsQueryableDocIds that verifies lookup respects queryable doc ids when upsert is enabled.

Testing

• No automated test suites (mvn/CI) were executed as part of this change.
• Added/updated tests include MultiStageEngineIntegrationTest.testDimensionTableUpsertSelection (integration) and DimensionTableDataManagerTest.testLookupRespectsQueryableDocIds (unit), but these tests were added and not run in this rollout.
• Existing test usages and benchmark helpers were updated to construct the new config parameter where needed and compile-time imports were adjusted accordingly.

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Codex Task