[Multiple Datasource] Use data source filter function before rendering

[BionIT]

Description

This change will store all data sources fetched during initial load, then apply the datasource filter function before rendering so that it can filter based on changes in the filter function.

Issues Resolved

Fixes #6174

Screenshot

filterbeforerender.mp4

Testing the changes

The following steps were performed in the recording:

1. go to add sample data, and data source selector should render correctly with currently available data sources
2. add sample data from a data source is successful, and dashboard renders successfully
3. go to dev tool, and data source selector should render correctly with currently available data sources
4. make a query and is successfully returning response
5. go to search relevance and the data source selector should render correctly, with local cluster as default option and no other options available to choose
6. select a data source from the data source menu in the nav bar which acts as filter, then check the data source selector, which should have the selected data source as another option in addition to local cluster

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

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 67.25%. Comparing base (d2347ca) to head (f835a57).

Files	Patch %	Lines
...ents/data_source_selector/data_source_selector.tsx	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6175      +/-   ##
==========================================
- Coverage   67.25%   67.25%   -0.01%     
==========================================
  Files        3345     3345              
  Lines       64840    64835       -5     
  Branches    10435    10432       -3     
==========================================
- Hits        43606    43602       -4     
  Misses      18690    18690              
+ Partials     2544     2543       -1     

Flag	Coverage Δ
Linux_1	31.64% <ø> (ø)
Linux_2	55.45% <ø> (ø)
Linux_3	44.74% <80.00%> (?)
Linux_4	35.06% <0.00%> (+<0.01%)	⬆️
Windows_1	31.67% <ø> (ø)
Windows_2	55.41% <ø> (ø)
Windows_3	44.74% <80.00%> (-0.01%)	⬇️
Windows_4	35.06% <0.00%> (+<0.01%)	⬆️

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[ZilongX]

LGTM, picked up latest main branch and now rerun all checks

[Flyingliuhub]

Do we have UT to cover this changes? Thanks

[bandinib-amzn]

+1. Approved but I'm wondering if we need UT for this change.

[BionIT]

yes, we use the same unit test for the filtering which was added when the datasource filter was introduced https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/src/plugins/data_source_management/public/components/data_source_selector/data_source_selector.test.tsx#L137