[fix](regression) Enable Paimon GCS regression

[xylaaaaa]

What problem does this PR solve?

Issue Number: None

Related PR: None

Problem Summary: Re-enable test_paimon_gcs in the external regression pipeline and explicitly mark the Paimon catalog storage as GCS so Doris does not infer it as another S3-compatible provider. The case continues to use the existing S3-compatible warehouse path for GCS because the FE pipeline classpath does not provide native gs:// Paimon FileIO support.

Release note

None

Check List (For Author)

• Test: Regression test / Unit Test
  • Regression test: ./run-regression-test.sh --run --conf regression-test/pipeline/external/conf/regression-conf.groovy -d external_table_p0/paimon -s test_paimon_gcs -dryRun
  • Unit Test: ./run-fe-ut.sh --run org.apache.doris.datasource.property.storage.GCSPropertiesTest
• Behavior changed: No
• Does this need documentation: No

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[Copilot]

Pull request overview

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Updates the Paimon GCS regression test to use the correct GCS warehouse scheme and enables the suite to run in the external regression pipeline.

Changes:

• Switch warehouse URI from s3:// to gs:// in the Paimon GCS test suite.
• Add fs.gcs.support = true to the relevant CREATE CATALOG definitions.
• Remove test_paimon_gcs from the external regression excludeSuites list.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
regression-test/suites/external_table_p0/paimon/test_paimon_gcs.groovy	Uses gs:// warehouse and enables GCS filesystem support in catalog properties.
regression-test/pipeline/external/conf/regression-conf.groovy	Allows test_paimon_gcs to run by removing it from exclusions.

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[xylaaaaa]

run buildall

[xylaaaaa]

run buildall