[Discover 2.0] Updating fetch functions to include local cluster

[sejli]

Description

• Update datasources fetch function to include local cluster
• Check for duplicates when fetching external datasources (in the case local cluster is added as a datasource)
• Clean up types in DataSetNavigator so items are displayed properly

Issues Resolved

Screenshot

Testing the changes

Changelog

• fix: fix tables not displaying in navigator and add local cluster to datasources

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]

❌ Empty Changelog Section

The Changelog section in your PR description is empty. Please add a valid changelog entry or entries. If you did add a changelog entry, check to make sure that it was not accidentally included inside the comment block in the Changelog section.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.

Project coverage is 63.65%. Comparing base (8441667) to head (1a0ce7c).

Files	Patch %	Lines
...navigator/lib/utils/fetch_external_data_sources.ts	0.00%	8 Missing ⚠️
.../public/ui/dataset_navigator/dataset_navigator.tsx	0.00%	6 Missing ⚠️
.../dataset_navigator/lib/utils/fetch_data_sources.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7542      +/-   ##
==========================================
- Coverage   63.66%   63.65%   -0.01%     
==========================================
  Files        3629     3629              
  Lines       79499    79509      +10     
  Branches    12597    12599       +2     
==========================================
+ Hits        50610    50612       +2     
- Misses      25823    25832       +9     
+ Partials     3066     3065       -1     

Flag	Coverage Δ
Linux_1	30.76% <0.00%> (-0.01%)	⬇️
Linux_2	55.58% <ø> (ø)
Linux_3	40.23% <0.00%> (-0.01%)	⬇️
Linux_4	31.57% <0.00%> (-0.01%)	⬇️
Windows_1	30.78% <0.00%> (-0.01%)	⬇️
Windows_2	55.53% <ø> (ø)
Windows_3	40.24% <0.00%> (-0.01%)	⬇️
Windows_4	31.57% <0.00%> (-0.01%)	⬇️

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[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-7542-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 72876991bcfc958d24ea8fcc15fac9b4a83c1bd9
# Push it to GitHub
git push --set-upstream origin backport/backport-7542-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-7542-to-2.x.

[opensearch-trigger-bot]

The backport to 2.16 failed:

The process '/usr/bin/git' failed with exit code 1

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-2.16 2.16
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch-Dashboards/backport-2.16
# Create a new branch
git switch --create backport/backport-7542-to-2.16
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 72876991bcfc958d24ea8fcc15fac9b4a83c1bd9
# Push it to GitHub
git push --set-upstream origin backport/backport-7542-to-2.16
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch-Dashboards/backport-2.16

Then, create a pull request where the base branch is 2.16 and the compare/head branch is backport/backport-7542-to-2.16.

[AMoo-Miki]

Backported with #7574