feat: Set datasource panel open by default on Explore view

[kgabryje]

SUMMARY

Datasource panel is open by default when user enters Explore view

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

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

CC: @ktmud @junlincc

[ktmud]

Should this state be persistent?

[kgabryje]

Should this state be persistent?

I'm not aware of such requirement. @junlincc What do you think?

[zhaoyongjie]

can provide the client to save this status?

[junlincc]

Should this state be persistent?

I'm not aware of such requirement. @junlincc What do you think?

the data panel should be collapsible at this intermediate stage, we should make it persistent when both drag and drop control panel and panel width resizing are available this year.

[ktmud]

LGTM

[codecov-io]

Codecov Report

Merging #12211 (f381f92) into master (f3ab1f4) will increase coverage by 0.89%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #12211      +/-   ##
==========================================
+ Coverage   66.20%   67.10%   +0.89%     
==========================================
  Files         996      996              
  Lines       49174    49262      +88     
  Branches     4993     5018      +25     
==========================================
+ Hits        32554    33055     +501     
+ Misses      16476    16084     -392     
+ Partials      144      123      -21     

Flag	Coverage Δ
cypress	51.29% <100.00%> (+7.19%)	⬆️
javascript	61.13% <0.00%> (+0.01%)	⬆️
python	64.16% <ø> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
...nd/src/explore/components/ExploreViewContainer.jsx	78.57% <100.00%> (ø)
superset/db_engine_specs/sqlite.py	65.62% <0.00%> (-9.38%)	⬇️
...rontend/src/explore/components/PropertiesModal.tsx	51.06% <0.00%> (-8.94%)	⬇️
superset/utils/celery.py	96.42% <0.00%> (-3.58%)	⬇️
superset/result_set.py	96.69% <0.00%> (-1.66%)	⬇️
superset/cli.py	33.58% <0.00%> (-0.92%)	⬇️
superset/db_engine_specs/presto.py	82.68% <0.00%> (-0.65%)	⬇️
...et-frontend/src/explore/reducers/exploreReducer.js	43.33% <0.00%> (-0.53%)	⬇️
superset/connectors/sqla/models.py	91.24% <0.00%> (-0.27%)	⬇️
superset/async_events/api.py	100.00% <0.00%> (ø)
... and 73 more

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[junlincc]

LGTM.

@kgabryje let's get Fixed width for dataset panel test done as well soon to have a perfect data panel. thanks for the enhancement!