[SPARK-41542][CONNECT][TESTS] Set parallelism as 1 for coverage report in Spark Connect #39085
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What changes were proposed in this pull request?
This PR proposes to set parallelism as 1 for coverage report in Spark Connect. Currently, the coverage report consistently fails for Spark Connect, see https://github.com/apache/spark/actions/runs/3663716955/jobs/6193686439
Why are the changes needed?
To make Spark Connect build working (Spark Connect requires 1 parallelism). Note that this is consistent with our PR builder, see
spark/.github/workflows/build_and_test.yml
Line 405 in 919e556
Does this PR introduce any user-facing change?
No, dev-only.
How was this patch tested?
Will monitor the jobs and https://app.codecov.io/gh/apache/spark after merging this.