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

[joshuali925]

Description

• update the query assist logic for retrieving data source id through connection service to dataset manager, as connection service is removed in [Discover-next] data set picker #7426
• add dataset mock to query mock in data plugin

Issues Resolved

Screenshot

Testing the changes

Changelog

• skip

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

[joshuali925]

@kavilla why is there a skip 1 in dataset manager? i had to add a startWith to make it work

OpenSearch-Dashboards/src/plugins/data/public/query/dataset_manager/dataset_manager.ts

Line 29 in adbdd95

return this.dataSet$.asObservable().pipe(skip(1));

[ashwin-pc]

He copied it over from the query manager. Yeah i dont think it needs to be there either. Feel free to remove it. We need the value of the dataset immediately

[kavilla]

+1

[joshuali925]

thanks for confirming, i removed it

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 54.27%. Comparing base (6a079d3) to head (dea9208).

Files	Patch %	Lines
...ublic/query_assist/components/query_assist_bar.tsx	0.00%	4 Missing ⚠️
...ta/public/query/dataset_manager/dataset_manager.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                    @@
##           feature/discover-2.0    #7464      +/-   ##
========================================================
+ Coverage                 54.20%   54.27%   +0.06%     
========================================================
  Files                      3251     3250       -1     
  Lines                     70654    70611      -43     
  Branches                  10828    10822       -6     
========================================================
+ Hits                      38299    38324      +25     
+ Misses                    30334    30263      -71     
- Partials                   2021     2024       +3     

Flag	Coverage Δ
Linux_1	30.76% <0.00%> (+<0.01%)	⬆️
Linux_2	55.60% <ø> (ø)
Windows_1	30.78% <0.00%> (+<0.01%)	⬆️
Windows_2	55.55% <ø> (ø)
Windows_4	31.57% <37.50%> (+0.08%)	⬆️

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