[build] Add -B (batch mode) to Maven/mvnd CI invocations

[gnodet]

Summary

• Add -B (batch mode) flag to MVND_OPTS in the install-mvnd action, covering all mvnd invocations across CI scripts
• Add -B to the two ./mvnw calls in incremental-build.sh that don't use MVND_OPTS

This suppresses JLine terminal warnings in CI logs:

WARNING: Unable to create a system terminal, creating a dumb terminal (enable debug logging for more information)

Test plan

• CI runs should no longer show JLine terminal warnings

[github-actions]

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