feat(xo6/role): add side panel to the roles list

[ByScripts]

⚠️ Wait for #10301

Description

Selecting a role in the list opens a side panel showing its description, its privileges, and the users and groups it is assigned to. Users are split between those holding the role directly and those inheriting it from a group.

See XO-2660.

Screenshots

Screenshot(s) of the visual changes

Checklist

• Commit
  • Title follows commit conventions
  • Reference the relevant issue (Fixes #007, See xoa-support#42, See https://...)
  • If bug fix, add Introduced by
• Changelog
  • If visible by XOA users, add changelog entry
  • Update "Packages to release" in CHANGELOG.unreleased.md
• PR
  • If UI changes, add screenshots
  • If not finished or not tested, open as Draft

Review process

If you are an external contributor, you can skip this part. Simply create the pull request, and we'll get back to you as soon as possible.

This 2-passes review process aims to:

• develop skills of junior reviewers
• limit the workload for senior reviewers
• limit the number of unnecessary changes by the author

1. The author creates a PR.
2. Review process:
   1. The author assigns the junior reviewer.
   2. The junior reviewer conducts their review:
      • Resolves their comments if they are addressed.
      • Adds comments if necessary or approves the PR.
   3. The junior reviewer assigns the senior reviewer.
   4. The senior reviewer conducts their review:
      • If there are no unresolved comments on the PR → merge.
      • Otherwise, we continue with 3.
3. The author responds to comments and/or makes corrections, and we go back to 2.

Notes:

1. The author can request a review at any time, even if the PR is still a Draft.
2. In theory, there should not be more than one reviewer at a time.
3. The author should not make any changes:
   • When a reviewer is assigned.
   • Between the junior and senior reviews.
4. If the PR relates to a change in the openAPI specification, a member of the DevOps team must also participate in the review.

[plane-sync-vates]

Linked to Plane Work Item(s)

• (XO-2660) [XO6][UserMgmt] "User management" > Roles: open details panel on table row click

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