Add tooltips to context menus

[cinnamon-msft]

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Summary of the Pull Request

Add tooltips to the tab context menu and the tab dropdown menu.

References

PR Checklist

• [x] Closes #13243
• [x] CLA signed. If not, go over here and sign the CLA
• [ ] Tests added/passed
• [ ] Documentation updated. If checked, please file a pull request on our docs repo and link it here: #xxx
• [ ] Schema updated.
• [x] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed