Add 2.19 Release Notes

[LDrago27]

Description

Add 2.19 Release Notes.

Issues Resolved

Screenshot

Testing the changes

Changelog

• doc: Add 2.19 Release Notes

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[github-actions]

❌ Invalid Prefix

Invalid description prefix. Found "docs". Expected "breaking", "deprecate", "feat", "fix", "infra", "doc", "chore", "refactor", "security", "skip", or "test".

[opensearch-trigger-bot]

The backport to main 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/OpenSearch-Dashboards/backport-main main
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch-Dashboards/backport-main
# Create a new branch
git switch --create backport/backport-9325-to-main
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 f04c140417a3fbb14fd8391fee1807e225f021c9
# Push it to GitHub
git push --set-upstream origin backport/backport-9325-to-main
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch-Dashboards/backport-main

Then, create a pull request where the base branch is main and the compare/head branch is backport/backport-9325-to-main.