Kgp bulk update

[jesswrd]

Add kgp to plugins bulk update dependency tooling.

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• I added new tests to check the change I am making, or I have commented below to indicate which test exemption this PR falls under¹.
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[gemini-code-assist]

Code Review

This pull request adds functionality to the dependency update tool to support bulk updates for the Android Gradle Plugin (AGP) and Kotlin Gradle Plugin (KGP). This is achieved by adding new dependency types, corresponding version validation logic, and file update mechanisms targeting settings.gradle. The PR also includes comprehensive tests for the new functionality.

My review includes two main points for improvement in script/tool/lib/src/update_dependency_command.dart:

1. Refactoring duplicated code for handling AGP and KGP updates to improve maintainability.
2. Making the version validation regex for KGP more flexible to support future versioning schemes, such as minor versions with two digits (e.g., 1.10.0) or pre-release tags.

[reidbaker]

Can you extract this out into a constant that is referenced here.

[jesswrd]

done