feat: 🎸 Add grant templates for roles

[ZedLi]

Description

Added grant templates which are suggestions that are currently completely static data and can be used as a base for writing grants for users.

Screenshots (if appropriate)

Screen.Recording.2025-12-19.at.3.24.46.PM.mov

How to Test

Go to the roles page and try using the add grant templates action.

Checklist

• I have added before and after screenshots for UI changes
• [ ] I have added JSON response output for API changes
• [ ] I have added steps to reproduce and test for bug fixes in the description
• I have commented on my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have added a11y-tests label to run a11y audit tests if needed

PCI review checklist

• I have documented a clear reason for, and description of, the change I am making.
• If applicable, I've documented a plan to revert these changes if they require more than reverting the pull request.
• If applicable, I've documented the impact of any changes to security controls.
  Examples of changes to security controls include using new access control methods, adding or removing logging pipelines, etc.

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Project	Deployment	Review	Updated (UTC)
boundary-ui	Ready	Preview, Comment	Dec 19, 2025 9:51pm
boundary-ui-desktop	Ready	Preview, Comment	Dec 19, 2025 9:51pm