[Multiple Datasource] Remove arrow down icon from data source selectable component

[BionIT]

Description

This change is part of #6216 to remove arrowdown icon from data source selectable component

Issues Resolved

Screenshot

removeicon.mp4

Testing the changes

After removing the arrow down icon, the data source selectable component renders correctly

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.35%. Comparing base (4f1884b) to head (809f68b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6257   +/-   ##
=======================================
  Coverage   67.35%   67.35%           
=======================================
  Files        3353     3353           
  Lines       65083    65083           
  Branches    10483    10483           
=======================================
+ Hits        43837    43839    +2     
+ Misses      18695    18694    -1     
+ Partials     2551     2550    -1     

Flag	Coverage Δ
Linux_1	31.82% <ø> (ø)
Linux_2	55.57% <ø> (ø)
Linux_3	44.83% <ø> (-0.01%)	⬇️
Linux_4	35.03% <ø> (ø)
Windows_1	31.84% <ø> (ø)
Windows_2	55.53% <ø> (ø)
Windows_3	44.85% <ø> (+<0.01%)	⬆️
Windows_4	35.03% <ø> (ø)

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[AMoo-Miki]

@BionIT can you please add a changelog entry for visual enhancement to data source selection?

[BionIT]

@BionIT can you please add a changelog entry for visual enhancement to data source selection?

done! Thanks @AMoo-Miki ! One question, for improvement for unreleased change, do we need to add change log as well?

[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/OpenSearch-Dashboards/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch-Dashboards/backport-2.x
# Create a new branch
git switch --create backport/backport-6257-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 74e0df3b86e5d70b11a7c2eb03082b09e0f985c5
# Push it to GitHub
git push --set-upstream origin backport/backport-6257-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch-Dashboards/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-6257-to-2.x.