[SPARK-54906][PYTHON][TESTS][FOLLOWUP] Try to use a real module name instead of __main__

[ueshin]

What changes were proposed in this pull request?

Tries to use a real module name in the test failure report instead of __main__.

Why are the changes needed?

In the test failure report, it uses __main__ as a module name after #53683.

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FAIL [0.309s]: test_apply_batch_with_type (__main__.FrameApplyFunctionTests.test_apply_batch_with_type)
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It should be a real module name as before.

======================================================================
FAIL [0.322s]: test_apply_batch_with_type (pyspark.pandas.tests.computation.test_apply_func.FrameApplyFunctionTests.test_apply_batch_with_type)
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Does this PR introduce any user-facing change?

Yes, the test failure report will show a real module name.

How was this patch tested?

Manually.

Was this patch authored or co-authored using generative AI tooling?

Cursor (gpt-5.2-codex)

[github-actions]

JIRA Issue Information

=== Test SPARK-54906 ===
Summary: Unify entries for all tests
Assignee: Tian Gao
Status: Resolved
Affected: ["4.2.0"]

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[ueshin]

cc @gaogaotiantian

[gaogaotiantian]

Ah, it's because we used to do a from ... import * so all the test cases so all the test cases are labelled with the module path. Yeah this is one way to do it. If tests passed I think it's good. Thanks!

[zhengruifeng]

thanks, merged to master