feat: Add external links to tabs #2243

[himaSH97]

The PR fulfills these requirements: (check all the apply)

• It's submitted to the main branch.
• When resolving a specific issue, it's referenced in the PR's title (e.g. feat: Add a button #xxx, where "xxx" is the issue number).
• When resolving a specific issue, the PR description includes Closes #xxx, where "xxx" is the issue number.
• If changes were made to ui folder, unit tests (make test) still pass.
• New/updated tests are included

[himaSH97]

Fixes #2243

Summary

Adds an optional link property to ui.tab.

When link is set, clicking the tab navigates to the supplied external URL.
Tabs without link retain their current behavior and continue emitting backend
events.

Tests