Fallback if system time incorrect during migration

[0xFirekeeper]

PR-Codex overview

This PR enhances the GenerateDataKey method in the AWS.cs file by adding an optional dateOverride parameter. This allows for custom date handling when generating a data key, improving error handling related to signature validation.

Detailed summary

• Added an optional dateOverride parameter to the GenerateDataKey method.
• Modified the date handling to use dateOverride if provided; otherwise, it defaults to DateTime.UtcNow.
• Introduced a new format string for amzDate.
• Added error handling to retry the data key generation with a parsed date from the response if an InvalidSignatureException occurs.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.17%. Comparing base (65107c5) to head (a80dade).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
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  Coverage   78.17%   78.17%           
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  Files          28       28           
  Lines        4358     4358           
  Branches      610      610           
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  Hits         3407     3407           
  Misses        787      787           
  Partials      164      164           

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