Refactor and update existing ml roles

[b4sjoo]

Description

This PR refactor and update exisiting ml roles

Check List

• New functionality includes testing
• New functionality has been documented
• 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.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[cwperks]

@b4sjoo @ylwu-amzn @lezzago

If this PR and associated PR in security-dashboards-plugin are intended for 2.13 please mark this approved to signal to the security maintainers that it is good to go and also get signoff from @bbarani for inclusion in the release as this is post code freeze.

Concerns about previous name are N/A as it never shipped.

[b4sjoo]

@peternied @cwperks Hi security team, just want to let you know we are good to ship both this PR and the dashboard one. I am also going to notify @bbarani. In the meantime, you can either merge this one first and wait @bbarani to sign-off the 2.13 backport, or wait until his sign-off to merge it to mainline and backport.

[cwperks]

FYI This has already been merged to 2.13, this will get merged to main and 2.x shortly but the merge to 2.13 was done first.

[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/security/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/security/backport-2.x
# Create a new branch
git switch --create backport/backport-4151-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 ef72e4c1e539a98a83dd9882e5f3d10d33ad3a2d
# Push it to GitHub
git push --set-upstream origin backport/backport-4151-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/security/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-4151-to-2.x.