Add FabricSpark dbt-date integration tests and move BaseDbtPackageTests to shared module

[sdebruyn]

Summary

• Adds FabricSpark integration test class TestDbtDate in tests/fabricspark/packages/test_dbt_date.py
• Moves BaseDbtPackageTests from tests/fabric/packages/ to tests/packages/ so both Fabric and FabricSpark suites import from a shared, adapter-neutral location
• Updates all 7 existing Fabric package test imports and CLAUDE.md to use the new path
• Uses centralized dbt_date_repo and dbt_date_revision fixtures from BaseDbtPackageTests
• Relies on dbt-date's existing spark__ macros (found via FabricSpark's dependencies=["spark"] dispatch chain)
• Uses America/Los_Angeles timezone to match dbt-date's Spark integration test fixtures
• Excludes expression_is_true tests: upstream fixture renders cast('to_date(...)' as date) with nested single quotes causing Spark PARSE_SYNTAX_ERROR

Test plan

• Run uv run pytest --de -k "TestDbtDate" against a Fabric Lakehouse — 1 passed (6 models, 0 errors)
• Run uv run pytest --dw -k "packages" to verify Fabric package tests still work with the new import path — 7 passed (TestDbtDate Fabric failure is pre-existing, unrelated to import change)
• No macro overrides needed — dbt-date's spark__ macros work via FabricSpark's dependencies=["spark"] dispatch chain

Closes #175

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[Copilot]

Pull request overview

Adds a new FabricSpark integration test that exercises the upstream dbt-date package’s integration_tests project against the fabricspark adapter, validating that Spark-dispatched macros work correctly in FabricSpark.

Changes:

• Introduces TestDbtDate integration test suite for FabricSpark, pulling dbt-date (and its integration_tests subdirectory) from GitHub at 0.17.2.
• Configures dbt_date:time_zone to America/Los_Angeles and adds dispatch for the dbt_date_integration_tests namespace.
• Runs the full package workflow (deps, seed, run, test) as part of the integration test.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 12 changed files in this pull request and generated no new comments.