fix: allow creation of workspace based on desk user role perms (backport #26617)

[mergify]

Currently, there is no way of restricting the creation of Workspaces depending on certain roles and permissions.

Adds the ability to check and restrict Workspace creation only to configured roles.

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This is an automatic backport of pull request #26617 done by Mergify.

[mergify]

Cherry-pick of 61807dd has failed:

On branch mergify/bp/version-15-hotfix/pr-26617
Your branch is up to date with 'origin/version-15-hotfix'.

You are currently cherry-picking commit 61807dda71.
  (fix conflicts and run "git cherry-pick --continue")
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Changes to be committed:
	modified:   frappe/desk/desktop.py
	modified:   frappe/desk/doctype/workspace/workspace.py
	modified:   frappe/public/js/frappe/views/workspace/workspace.js

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   frappe/desk/doctype/workspace/workspace.json

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[frappe-pr-bot]

🎉 This PR is included in version 15.29.1 🎉

The release is available on GitHub release

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