chore: Expose clear state methods in public runtime API

[just-boris]

Description

Move cleanup methods from awsuiPluginsInternal to awsuiPlugins so our consumers can also write unit tests on the runtime API as well

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

How has this been tested?

Updated related unit tests

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 97.13%. Comparing base (1369fb7) to head (1db1895).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4121   +/-   ##
=======================================
  Coverage   97.13%   97.13%           
=======================================
  Files         873      873           
  Lines       25553    25553           
  Branches     9239     9239           
=======================================
  Hits        24821    24821           
  Misses        726      726           
  Partials        6        6           

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