Add integration tests for filters against various join types

[tlento]

We currently have an incomplete set of integration tests for filters
involving joins - our existing test only covers a filter against
the joined in dimension, and then implicitly discards all null values.

This change adds more robust coverage, including filters against
our current range of supported dimension join types (FULL OUTER and LEFT OUTER)
and joins allowing for NULL values on the tables that might return
NULL due to a join miss.

These tests help make some of the test coverage around predicate pushdown
operations a bit more explicit, although they are not about pushdown
specifically.

[tlento]

• Enable PredicatePushdownOptimization for all MetricFlowEngine queries #1308
• Enforce order of application for DataflowPlanOptimizers #1307
• Enable SourceScanOptimizer in query rendering tests #1306
• Add SQL rendering tests for pushdown edge cases #1305
• Remove duplicated WhereConstraintNodes in predicate pushdown #1304
• Add direct tests for predicate pushdown optimizer #1303
• Track and propagate applied where filter specs to outer plan nodes #1302
• Simplify predicate pushdown state tracking #1301
• Consolidate where constraint predicate pushdown management #1300
• Move categorical dimension filter pushdown to PredicatePushdownOptimizer #1286
• Move node dataset resolver subquery ids into a separate namespace #1280
• Verify column sets match in optimizer pushdown evaluation #1279
• Update API for requesting dataflow plan optimization #1278
• Store a list of input WhereFilterSpecs in the WhereConstraintNode #1277
• Enable DataflowPlanOptimizers for query rendering tests #1263
• Add PredicatePushdownOptimizer in tracking-only mode #1262
• Add integration tests for filters against various join types #1240 👈
• Enable predicate pushdown for categorical dimension filters #1227
• Add semantic_model_origin property to LinkableElement interface #1230
• Add element type property to LinkableElement interface #1226
• Encapsulate time range constraint application in more general method #1225
• Rename PredicatePushdownParameters to PredicatePushdownState #1224
• Make source_semantic_models property accessible from a DataflowPlanNode #1218
• Use pushdown params to disable time range constraint pushdown #1216 : 1 other dependent PR (#1217 )
• Encapsulate time range constraints for predicate pushdown #1215
• Add conversion metric rendering tests #1214
• main

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[tlento]

Merge activity

• Jun 24, 8:29 PM PDT: @tlento started a stack merge that includes this pull request via Graphite.
• Jun 24, 8:35 PM PDT: Graphite rebased this pull request as part of a merge.
• Jun 24, 8:39 PM PDT: @tlento merged this pull request with Graphite.