Remove unused files

[mengweieric]

Description

Remove leftover icons and update snapshots.

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 #650 (ae0c03e) into 1.3 (63cf078) will decrease coverage by 0.45%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              1.3     #650      +/-   ##
==========================================
- Coverage   46.42%   45.97%   -0.45%     
==========================================
  Files         201      192       -9     
  Lines        5577     5457     -120     
  Branches     1357     1279      -78     
==========================================
- Hits         2589     2509      -80     
+ Misses       2955     2921      -34     
+ Partials       33       27       -6     

Flag	Coverage Δ
dashboards-observability	45.97% <ø> (-0.45%)	⬇️

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see 13 files with indirect coverage changes

[opensearch-trigger-bot]

The backport to 1.2 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-1.2 1.2
# Navigate to the new working tree
cd .worktrees/backport-1.2
# Create a new branch
git switch --create backport/backport-650-to-1.2
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 28181285a8eee463afa63b57eb7e7c935ecf822b
# Push it to GitHub
git push --set-upstream origin backport/backport-650-to-1.2
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.2

Then, create a pull request where the base branch is 1.2 and the compare/head branch is backport/backport-650-to-1.2.