TPC-DS Plan Stability Suites Not Running in CI

[andygrove]

Describe the bug

Regression was introduced in #2178

We only run the tests if the scan is auto mode:

  if (CometConf.COMET_NATIVE_SCAN_IMPL.get() == CometConf.SCAN_AUTO) {
    tpcdsQueriesV2_7_0.foreach { q =>
      test(s"check simplified (tpcds-v2.7.0/$q)") {
        testQuery("tpcds-v2.7.0", q)
      }
    }
  }

We use an env var to specify scan type:

    - name: Run all tests
      shell: bash
      if: ${{ inputs.suites == '' }}
      env:
        COMET_PARQUET_SCAN_IMPL: ${{ inputs.scan_impl }}

The PR builds never specify auto:

          - name: "Spark 3.5.5, JDK 17, Scala 2.13"
            java_version: "17"
            maven_opts: "-Pspark-3.5 -Dspark.version=3.5.5 -Pscala-2.13"
            scan_impl: "native_comet"

Steps to reproduce

No response

Expected behavior

No response

Additional context

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