fix: prevent user from deleting their own roles

[Emnaghz]

Motivation

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Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (Storybook)
• I have added unit tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[medtaher123]

I have a suggestion: wouldn't it be better to prevent role deletion only if the role is still in use? In other words, a role can only be deleted after it has been removed from all users who are using it