Remove deprecated layout editor

[mengweieric]

Description

Remove deprecated layout editor.

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• 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.

[codecov]

Codecov Report

Merging #589 (e33a18c) into main (bd11c23) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #589      +/-   ##
==========================================
- Coverage   43.43%   43.42%   -0.02%     
==========================================
  Files         300      300              
  Lines       18118    18113       -5     
  Branches     4447     4447              
==========================================
- Hits         7870     7866       -4     
+ Misses       9713     9712       -1     
  Partials      535      535              

Flag	Coverage Δ
dashboards-observability	43.42% <ø> (-0.02%)	⬇️

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see 1 file with indirect coverage changes

[opensearch-trigger-bot]

The backport to 2.4 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-2.4 2.4
# Navigate to the new working tree
cd .worktrees/backport-2.4
# Create a new branch
git switch --create backport/backport-589-to-2.4
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 0a803dc69b67262e8b58ffb56fc9ad5c8e473469
# Push it to GitHub
git push --set-upstream origin backport/backport-589-to-2.4
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.4

Then, create a pull request where the base branch is 2.4 and the compare/head branch is backport/backport-589-to-2.4.