fix: datasource editor doesn't save schema

[lilykuang]

SUMMARY

• fix issue with datasource edit doesn't save schema on chart explore

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

https://www.loom.com/share/46b790bdb5cc4128893b8373f6f9eaf2

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue: Datasource edit doesn't save schema, only saves new dataset name #11380
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-io]

Codecov Report

Merging #11396 into master will decrease coverage by 4.19%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master   #11396      +/-   ##
==========================================
- Coverage   65.79%   61.59%   -4.20%     
==========================================
  Files         838      838              
  Lines       39903    39901       -2     
  Branches     3662     3663       +1     
==========================================
- Hits        26253    24579    -1674     
- Misses      13549    15141    +1592     
- Partials      101      181      +80     

Flag	Coverage Δ
#cypress	?
#javascript	62.67% <33.33%> (-0.01%)	⬇️
#python	60.95% <ø> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...perset-frontend/src/datasource/DatasourceModal.tsx	72.54% <33.33%> (-23.46%)	⬇️
superset-frontend/src/SqlLab/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/dashboard/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/index.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/dashboard/index.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/setup/setupColors.js	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/chart/ChartContainer.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/setup/setupFormatters.js	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/reducers/index.js	0.00% <0.00%> (-100.00%)	⬇️
... and 169 more

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