Unify AWS Date Override Behavior

[0xFirekeeper]

Fixes TOOL-3020

---

PR-Codex overview

This PR focuses on refactoring the GenerateDataKey and InvokeLambdaWithTemporaryCredentialsAsync methods in the AWS.cs file to improve code structure and reduce redundancy by introducing a new method PostAwsRequestWithDateOverride.

Detailed summary

• Removed the dateOverride parameter from GenerateDataKey.
• Introduced requestBodyString and extraHeaders for better readability.
• Replaced repetitive code with PostAwsRequestWithDateOverride.
• Enhanced error handling for AWS requests.
• Updated the signature generation logic to be more flexible.

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

[linear]

TOOL-3020 Apply DST / bad system time workaround in non-migration flow

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.68%. Comparing base (e3a9e72) to head (0602127).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
- Coverage   76.76%   76.68%   -0.09%     
==========================================
  Files          28       28              
  Lines        4799     4799              
  Branches      665      665              
==========================================
- Hits         3684     3680       -4     
- Misses        942      945       +3     
- Partials      173      174       +1     

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