fix: core coverage and add a coverage step in workflow

[zhaoyongjie]

SUMMARY

bring 100% code coverage to the superset-ui/core. this PR should wait for this to merge.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[zhaoyongjie]

This function is unused, a more readable expression is 'Table' in DatasourceType.

[codecov]

Codecov Report

Merging #20784 (329fe5a) into master (bb5b8e4) will decrease coverage by 0.05%.
The diff coverage is n/a.

❗ Current head 329fe5a differs from pull request most recent head 8387448. Consider uploading reports for the commit 8387448 to get more accurate results

@@            Coverage Diff             @@
##           master   #20784      +/-   ##
==========================================
- Coverage   66.30%   66.25%   -0.06%     
==========================================
  Files        1756     1756              
  Lines       66737    66735       -2     
  Branches     7049     7049              
==========================================
- Hits        44251    44216      -35     
- Misses      20689    20723      +34     
+ Partials     1797     1796       -1     

Flag	Coverage Δ
javascript	51.93% <ø> (+<0.01%)	⬆️
presto	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ges/superset-ui-core/src/query/types/Datasource.ts	100.00% <ø> (+33.33%)	⬆️
...et-frontend/src/dashboard/actions/sliceEntities.js	74.28% <ø> (ø)
superset/db_engine_specs/presto.py	84.26% <0.00%> (-4.77%)	⬇️
superset/connectors/sqla/models.py	89.36% <0.00%> (-0.97%)	⬇️
superset/models/core.py	88.43% <0.00%> (-0.25%)	⬇️
...ckages/superset-ui-core/src/query/DatasourceKey.ts	100.00% <0.00%> (+16.66%)	⬆️

[michael-s-molina]

LGTM