refactor sigv4 logic

[rishabh6788]

Description

This PR fixes the bug where the logic that needs cdk deploy to happen for opensource OS were running inside the sigv4 AWS credentials scope, required for AOS and AOSS. This was causing cdk deploy failures as permissions were getting overridden in the scope.

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.55%. Comparing base (d092678) to head (ced0a1b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #798   +/-   ##
=========================================
  Coverage     89.55%   89.55%           
  Complexity      129      129           
=========================================
  Files           121      121           
  Lines           680      680           
  Branches         44       44           
=========================================
  Hits            609      609           
  Misses           36       36           
  Partials         35       35           

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[peterzhuamazon]

Hi @rishabh6788 can you bump the version as well?

Thanks.

[rishabh6788]

Hi @rishabh6788 can you bump the version as well?

Thanks.

It was bumped in #796, I will run the increment version job again and get it bumped.

[opensearch-trigger-bot]

The backport to 11.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/backport-11.x 11.x
# Navigate to the new working tree
pushd ../.worktrees/backport-11.x
# Create a new branch
git switch --create backport/backport-798-to-11.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 2dc5f4f3f66937c9af213275ede59330a3aee3bf
# Push it to GitHub
git push --set-upstream origin backport/backport-798-to-11.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-11.x

Then, create a pull request where the base branch is 11.x and the compare/head branch is backport/backport-798-to-11.x.