Fix unbound variable issues

[duanemay]

Also, keep consistent handling of defaulting DB:-hsqldb in unit_test and integration_test scripts

[Copilot]

Pull request overview

This PR hardens the test/Gradle helper scripts against unbound variables and improves argument handling/quoting so wrapper scripts behave consistently across unit/integration test entrypoints.

Changes:

• Default DB to hsqldb in scripts/unit_tests.sh to avoid unbound-variable failures under set -u.
• Standardize argument forwarding to Gradle wrappers using "$@" (instead of "${@}" / ${*} patterns).
• Update scripts/gradle to execute Gradle with "$@" and default to tasks when invoked with no arguments.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
scripts/unit_tests.sh	Defaults DB to hsqldb when unset before booting the DB.
scripts/unit_tests	Adjusts argument forwarding to "$@" for Gradle test.
scripts/integration_tests	Adjusts argument forwarding to "$@" for Gradle integrationTest.
scripts/gradle	Fixes Gradle invocation quoting, adds no-arg default behavior, and tweaks logging.
scripts/debug_uaa.sh	Adjusts argument forwarding to "$@" for gradlew run.

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