chore: Clear feature notifications

[georgylobko]

Description

Updated clearFeatureNotifications to also clear initial messages, not just local state. This prevents feature notifications from being unnecessarily re-registered when the application remounts.

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

How has this been tested?

U test / manual test

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.44%. Comparing base (8093e3f) to head (9e03f06).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4343   +/-   ##
=======================================
  Coverage   97.44%   97.44%           
=======================================
  Files         897      897           
  Lines       26389    26395    +6     
  Branches     9524     9525    +1     
=======================================
+ Hits        25715    25721    +6     
  Misses        668      668           
  Partials        6        6           

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