[SPARK-45479][INFRA] Uses the default Python versions in the scheduled builds in other branches #43306
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What changes were proposed in this pull request?
This PR explicitly sets
PYTHON_TO_TESTto an empty string for other branches so they use their default Python versions.#43209 added a new option to the testing script but that option does not exist in other branches so it fails.
Why are the changes needed?
To recover the build (see https://github.com/apache/spark/actions/workflows/build_branch33.yml, https://github.com/apache/spark/actions/workflows/build_branch34.yml and https://github.com/apache/spark/actions/workflows/build_branch35.yml)
Does this PR introduce any user-facing change?
No, dev-only.
How was this patch tested?
After merging this, I will monitor the build. I locally tested the changes too.
Was this patch authored or co-authored using generative AI tooling?
No.