Correlation fixes

[amsiglan]

Description

1. Unable to create correlation rule since validation on submit finds error for missing fields even when group by is not selected by the user. This PR adds check for that.
2. Updated the default correlation window to 5 min.

Check List

• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (51d73c8) 30.99% compared to head (1e0650b) 31.01%.

❗ Current head 1e0650b differs from pull request most recent head 645878d. Consider uploading reports for the commit 645878d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #810      +/-   ##
==========================================
+ Coverage   30.99%   31.01%   +0.02%     
==========================================
  Files         151      151              
  Lines        5081     5084       +3     
  Branches      882      884       +2     
==========================================
+ Hits         1575     1577       +2     
- Misses       3316     3317       +1     
  Partials      190      190              

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[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 1

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-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-810-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 fba42a52852e73131e2e07256d3f8344d484c6e9
# Push it to GitHub
git push --set-upstream origin backport/backport-810-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-810-to-2.x.