[FEATURE] More validations on YAML rule editor

[djindjic]

Issues Resolved

Closes #214 #207

Check List

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[djindjic]

@amsiglan I've addressed Ming's UX improvement points in this PR

[amsiglan]

The windows cypress test failure was due to a slower loading time and unrelated to the changes made in this PR, hence it was okay to merge the changes.

[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-279-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 6da7c8298c0ae499750a4c50f27f532a2726d282
# Push it to GitHub
git push --set-upstream origin backport/backport-279-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-279-to-2.x.