Rename common-test project to common-testing

[devin-ai-integration]

Rename common-test project to common-testing

Changed the common-test project to common-testing.

• Renamed the project directory
• Updated settings.gradle.kts
• Updated build.gradle.kts files in dependent projects

Verified by running tests successfully.

Link to Devin run: https://app.devin.ai/sessions/db66bde5268d4ce98fcd0385e3692a2a
Requested by: Toshihiro Nakamura

[devin-ai-integration]

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