feat: dataset api endpoint for charts and dashboards count

[lilykuang]

SUMMARY

• create new GET endpoint for charts and dashboards count associated to a dataset
• when users try to delete a dataset, warning modal will show so that they know if a dataset is currently tied to charts and dashboards

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

• add new endpoint to dataset warning modal

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-commenter]

Codecov Report

Merging #10235 into master will decrease coverage by 16.92%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #10235       +/-   ##
===========================================
- Coverage   70.31%   53.38%   -16.93%     
===========================================
  Files         594      343      -251     
  Lines       31608    11419    -20189     
  Branches     3221     2848      -373     
===========================================
- Hits        22225     6096    -16129     
+ Misses       9275     5143     -4132     
- Partials      108      180       +72     

Flag	Coverage Δ
#cypress	53.38% <ø> (ø)
#javascript	?
#python	?

Impacted Files	Coverage Δ
...uperset-frontend/src/dashboard/util/dnd-reorder.js	0.00% <0.00%> (-100.00%)	⬇️
...rset-frontend/src/dashboard/util/getEmptyLayout.js	0.00% <0.00%> (-100.00%)	⬇️
.../src/dashboard/util/getFilterScopeFromNodesTree.js	0.00% <0.00%> (-93.48%)	⬇️
.../src/dashboard/components/FilterIndicatorGroup.jsx	11.76% <0.00%> (-88.24%)	⬇️
...c/explore/components/controls/withVerification.jsx	9.09% <0.00%> (-87.88%)	⬇️
...uperset-frontend/src/utils/getClientErrorObject.ts	0.00% <0.00%> (-87.10%)	⬇️
...src/dashboard/components/gridComponents/Header.jsx	10.52% <0.00%> (-86.85%)	⬇️
...rc/dashboard/components/gridComponents/Divider.jsx	13.33% <0.00%> (-86.67%)	⬇️
...c/dashboard/components/gridComponents/Markdown.jsx	6.59% <0.00%> (-82.42%)	⬇️
superset-frontend/src/components/Link.tsx	7.69% <0.00%> (-79.81%)	⬇️
... and 398 more

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[mistercrunch]

It could be good to be able to show a list of related objects instead of counts as users may want to go and alter those objects to point them to a new place.

The UI can still just show the counts, but the endpoint would be more useful that way.

[dpgaspar]

looking good, but I think that the OpenAPI spec is no correct, check it on \swaggerview\v1

[dpgaspar]

schema:
  type: object
  properties:
    dashboard_count:
      type: integer
    chart_count:
      type: integer

[nytai]

lgtm!