Add versioned user-agent to AWS API calls

[vedant-jaiswal]

Issue #, if available:

Description of changes:
Add versioned user-agent to AWS API calls

• Add getUserAgent() function that returns github-action/v{version} format
• Update SecretsManagerClient to use versioned user-agent
• Version automatically syncs with package.json
• Update package.json version to match latest release (2.0.10)
• Add unit tests for version format validation

Testing

• Added unit test.
• Runtime Validation
  node -e "const { getUserAgent } = require('./dist/constants.js'); console.log('User-Agent:', getUserAgent());"
Output: User-Agent: github-action/v2.0.10

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (aa511bf) to head (65aaecb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #272   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          160       164    +4     
  Branches        40        40           
=========================================
+ Hits           160       164    +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.