[SPARK-33129][BUILD][DOCS] Updating the build/sbt references to test-only with testOnly for SBT 1.3.x #30028
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What changes were proposed in this pull request?
test-only - > testOnly in docs across the project.
Why are the changes needed?
Since the sbt version is updated, the older way or running i.e.
test-onlyis no longer valid.Does this PR introduce any user-facing change?
docs update.
How was this patch tested?
Manually.