Add --batch-mode to mvn invocation in java/functions-framework
Add --batch-mode to mvn invocation in java/functions-framework

This hides the spammy download progress messages.

PiperOrigin-RevId: 326731373
Change-Id: If33cc6fc1933010af3f1b67c8fab037ced404452

GoogleCloudPlatform/buildpacks,GoogleCloudPlatform/buildpacks,GoogleCloudPlatform/buildpacks,GoogleCloudPlatform/buildpacks