Add release workflow for trusted publishing

[ubaskota]

Issue #, if available:

Description of changes:
Adds a GitHub Actions workflow for publishing AWSCLI to PyPI using trusted publishing (OIDC). This replaces credential-based publishing with a more secure, token-free approach where PyPI verifies the package origin directly through GitHub's OIDC identity.

Testing
Ran a test build and verified that a package was published to test.pypi as expected.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.60%. Comparing base (70d3b38) to head (6004854).
⚠️ Report is 54 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #10441      +/-   ##
===========================================
+ Coverage    93.42%   93.60%   +0.18%     
===========================================
  Files          211      211              
  Lines        17312    17355      +43     
===========================================
+ Hits         16174    16246      +72     
+ Misses        1138     1109      -29     

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