Bump mynahui to 4.21.5 and update /help output

[Jurredr]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Description

• Bumped MynahUI to version 4.21.5 from 4.21.2. This includes four bug fixes and one feature, as described by the changelog additions and by the MynahUI release notes.
• Updated the /help command output to include the new re:invent 2024 features. Copied from the VSCode toolkit repo's constant.

Checklist

• My code follows the code style of this project
• I have added tests to cover my changes
• A short description of the change has been added to the CHANGELOG if the change is customer-facing in the IDE.
• I have added metrics for my changes (if required)

License

I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

Qodana Community for JVM

It seems all right 👌

No new problems were found according to the checks applied

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