fix(query assist): update reading data source id from dataset

[joshuali925]

Description

NOTE: This PR is based on #7368. do not merge it before #7368.

The diff is hard to review because it contains change from another PR. See https://github.com/opensearch-project/OpenSearch-Dashboards/compare/26b16ffe0f098a35f54d8a819698d09550d97bc1%5E..joshuali925:pr/7368 for the change on top

This PR reverts the logic for retrieving data source id from using connection service back to current index pattern, as connection service is removed in #7368

Issues Resolved

Screenshot

Testing the changes

Changelog

• fix: update reading data source id from dataset in query assist

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 23.99021% with 621 lines in your changes missing coverage. Please review.

Project coverage is 63.76%. Comparing base (c8496f8) to head (1e5fa6c).
Report is 2 commits behind head on main.

Files	Patch %	Lines
.../public/ui/dataset_navigator/dataset_navigator.tsx	0.55%	179 Missing ⚠️
...taset_navigator/lib/catalog_cache/cache_loader.tsx	8.10%	136 Missing ⚠️
...taset_navigator/lib/catalog_cache/cache_manager.ts	3.93%	122 Missing ⚠️
...blic/ui/dataset_navigator/lib/utils/use_polling.ts	0.00%	57 Missing ⚠️
.../dataset_navigator/lib/hooks/direct_query_hook.tsx	2.94%	33 Missing ⚠️
...ta/public/ui/dataset_navigator/lib/requests/sql.ts	0.00%	18 Missing ⚠️
...ta/public/ui/dataset_navigator/lib/utils/shared.ts	88.23%	14 Missing ⚠️
...navigator/lib/utils/fetch_external_data_sources.ts	15.38%	11 Missing ⚠️
...ic/ui/dataset_navigator/lib/utils/fetch_indices.ts	11.11%	8 Missing ⚠️
.../data_explorer/public/components/sidebar/index.tsx	36.36%	7 Missing ⚠️
... and 13 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7418      +/-   ##
==========================================
- Coverage   64.06%   63.76%   -0.31%     
==========================================
  Files        3603     3627      +24     
  Lines       78477    79370     +893     
  Branches    12382    12547     +165     
==========================================
+ Hits        50280    50607     +327     
- Misses      25167    25715     +548     
- Partials     3030     3048      +18     

Flag	Coverage Δ
Linux_1	30.78% <21.72%> (+0.10%)	⬆️
Linux_2	55.57% <0.00%> (-0.01%)	⬇️
Linux_3	?
Linux_4	31.67% <23.50%> (-0.10%)	⬇️
Windows_1	30.80% <21.72%> (+0.10%)	⬆️
Windows_2	55.52% <0.00%> (-0.01%)	⬇️
Windows_3	40.36% <22.25%> (-0.30%)	⬇️
Windows_4	31.67% <23.50%> (-0.10%)	⬇️

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[joshuali925]

#7368 won't go in, closing this for #7464