mgr/dashboard: add telemetry notification regression tests - #72008

Fixes: https://tracker.ceph.com/issues/80794
Signed-off-by: Anurag Raut [email protected]

PR Description

When telemetry is already configured and activated, updating its configuration should not display the activation success notification. The functional fix is addressed in #70776.

This PR adds regression tests to verify that the Dashboard displays the correct success notification for both telemetry activation and updates to an existing configuration:

• Initial activation displays the configured and activated success notification.
• Updating an existing telemetry configuration displays an update-specific success notification.

Screencast:

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Checklist

• Tracker (select at least one)
  • References tracker ticket
  • Very recent bug; references commit where it was introduced
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  • Affects Dashboard, opened tracker ticket
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