Fix for notification setting for group with dot char in name

What does this MR do?

The issue is that Rails is parsing the dot for the :format parameter, so we add the constraint to tell rails the dot is part of the :id parameter.

Related issue: #29793 (closed)

Screenshots

I can now update notification settings for groups with dots in their name, where previously I could not:

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.