SONARJAVA-6219 Remove --batch-mode mvn argument to log repox downloads

[tomasz-tylenda-sonarsource]

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[hashicorp-vault-sonar-prod]

SONARJAVA-6219

[sonar-review-alpha]

Summary

This PR removes the --batch-mode flag from Maven invocations in CI workflows and refactors output-related flags into a reusable environment variable. The --batch-mode flag disables buffering and suppresses verbose output, so removing it allows Maven to log repository downloads (e.g., from Repox) which may be useful for debugging or observability. The -e and -V short flags are consolidated into MAVEN_OUTPUT_ARGS env var (--errors --show-version) for consistency and maintainability across three build jobs (ruling, plugin, sanity).

What reviewers should know

The change is straightforward: verify that the new MAVEN_OUTPUT_ARGS env var is correctly applied to all three Maven commands (lines 100, 156, 198) and that each command still has the same net effect. Note that the short flags -B -e -V are being replaced by an env var containing the expanded forms --errors --show-version (removing -B entirely). Check the commit message or linked Jira issue (SONARJAVA-6219) for context on why suppressing batch mode helps with repository download logging.

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[sonar-review-alpha]

Conclusion: One real regression in the it-plugin job — the parallel execution parameters were silently dropped alongside the batch-mode flags, which will cause those tests to run sequentially.

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[sonar-review-alpha]

The old command included -Dparallel=classes -DuseUnlimitedThreads=true, but both were dropped here. This appears to be an unintentional side-effect of cleaning up the batch-mode flags — the ruling-qa job (line 101) kept its equivalent -Dparallel=methods -DuseUnlimitedThreads=true. Without these, plugin-qa tests run sequentially, which will likely significantly increase CI time.

Suggested change

	mvn package ${MAVEN_OUTPUT_ARGS} -Pit-plugin -Dsonar.runtimeVersion=${{ matrix.item.sq_version }} -Dmaven.test.redirectTestOutputToFile=false
	mvn package ${MAVEN_OUTPUT_ARGS} -Pit-plugin -Dsonar.runtimeVersion=${{ matrix.item.sq_version }} -Dmaven.test.redirectTestOutputToFile=false -Dparallel=classes -DuseUnlimitedThreads=true

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[sonar-review-alpha]

LGTM! ✅

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[sonarqube-next]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0 Dependency risks
No data about Coverage
0.0% Duplication on New Code

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[leonardo-pilastri-sonarsource]

I saw the downloads from repox in the logs 👍