Move cumulative metric query rendering tests to new module

[tlento]

The test_dataflow_to_sql_plan module is being broken up
into smaller pieces. This one covers all cumulative metric
rendering tests.

[tlento]

Current dependencies on/for this PR:

• main
  • PR Split up test_dataflow_to_sql_plan module into more manageable components #836
    • PR Move cumulative metric query rendering tests to new module #837 👈
      • PR Move derived metric rendering tests to their own module #838
        • PR Move date part rendering tests to separate module #839
          • PR Move time spine and fill nulls rendering tests to separate module #840

This stack of pull requests is managed by Graphite.

[github-actions]

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[github-actions]

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[courtneyholcomb]

Was it intentional that you deleted the SqlQueryPlan snapshots in metricflow/test/snapshots/test_dataflow_to_sql_plan.py/SqlQueryPlan/?

[tlento]

Was it intentional that you deleted the SqlQueryPlan snapshots in metricflow/test/snapshots/test_dataflow_to_sql_plan.py/SqlQueryPlan/?

Yup! I left a comment on the base PR in the stack where the change was made.