Adding Alerting Comments system indices and Security ITs

[toepkerd]

Description

Adding Alerting Comments system indices to the Alerting Plugin's System Index Descriptors. Also adds Security ITs for Alerting Comments

This is a followup to #1655

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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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[eirsep]

can admin edit some one else's ccomment

if yes plz add that test to verify

[eirsep]

Approving this but admin being able to edit someone else’s comments is not a very organic requirement

[opensearch-trigger-bot]

The backport to 2.x failed:

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

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/alerting/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/alerting/backport-2.x
# Create a new branch
git switch --create backport-1659-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 d8f47a0f096a8f170e1c6424124afcba250f8682
# Push it to GitHub
git push --set-upstream origin backport-1659-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/alerting/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport-1659-to-2.x.