feat: Feature notifications

[georgylobko]

Description

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

❌ Patch coverage is 91.52542% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.14%. Comparing base (11a7464) to head (2b0c490).

Files with missing lines	Patch %	Lines
...efresh-toolbar/state/use-feature-notifications.tsx	93.13%	7 Missing ⚠️
...rc/internal/do-not-use/feature-prompt/internal.tsx	56.25%	6 Missing and 1 partial ⚠️
...l-refresh-toolbar/toolbar/trigger-button/index.tsx	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4186      +/-   ##
==========================================
- Coverage   97.19%   97.14%   -0.06%     
==========================================
  Files         886      888       +2     
  Lines       26008    26160     +152     
  Branches     9421     9481      +60     
==========================================
+ Hits        25278    25412     +134     
+ Misses        724      700      -24     
- Partials        6       48      +42     

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