Skip hybrid IT cases in premerge [fast-ut] [reduced-it] [databricks]

[res-life]

Contributes to #15404.

Description

Problem

Premerge invokes the Hybrid execution IT suite separately even though the nightly/default IT path already covers it. The invocation takes approximately 2 minutes 48 seconds, and reduced-IT selection only lowers the collected cases from 314 to 252 (19.7%). This makes case reduction ineffective for this scenario.

Change

Remove the Hybrid setup and hybrid_test invocation from mvn_verify in jenkins/spark-premerge-build.sh. Test definitions and the nightly test path are unchanged.

Impact

Premerge no longer spends approximately 2 minutes 48 seconds on this scenario. Hybrid execution remains fully covered by nightly CI, and developers can still run it explicitly with TEST_MODE=HYBRID_EXECUTION. There is no user-facing behavior change.

Validation

• bash -n jenkins/spark-premerge-build.sh
• git diff --check
• Verified that the existing hybrid_test suite still runs from jenkins/spark-tests.sh for DEFAULT and HYBRID_EXECUTION

Checklists

Documentation

• Updated for new or modified user-facing features or behaviors
• No user-facing change

Testing

• Added or modified tests to cover new code paths
• Covered by existing tests
  (hybrid_test remains in nightly DEFAULT and explicit HYBRID_EXECUTION modes.)
• Not required

Performance

• Tests ran and results are added in the PR description
• Issue filed with a link in the PR description
• Not required

[res-life]

build

[res-life]

build