test: Adds storybook to FormRow component

[michael-s-molina]

SUMMARY

• Adds storybook to FormRow component
• Moves FormRow tests to component's folder

TEST PLAN

1 - Execute FormRow tests
2 - All tests should pass

@rusackas

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]

Codecov Report

Merging #13407 (9b5f9cc) into master (f19a830) will decrease coverage by 3.32%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #13407      +/-   ##
==========================================
- Coverage   76.33%   73.00%   -3.33%     
==========================================
  Files         900      600     -300     
  Lines       45596    21160   -24436     
  Branches     5491     5418      -73     
==========================================
- Hits        34804    15448   -19356     
+ Misses      10648     5585    -5063     
+ Partials      144      127      -17     

Flag	Coverage Δ
cypress	57.94% <ø> (-0.85%)	⬇️
hive	?
javascript	62.72% <0.00%> (-0.04%)	⬇️
mysql	?
postgres	?
presto	?
python	?
sqlite	?

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Impacted Files	Coverage Δ
...rontend/src/components/FormRow/FormRow.stories.tsx	0.00% <0.00%> (ø)
superset-frontend/src/components/FormRow/index.jsx	92.30% <ø> (ø)
...erset-frontend/src/SqlLab/components/ResultSet.tsx	68.46% <0.00%> (-0.31%)	⬇️
superset/models/sql_lab.py
superset/examples/countries.py
...t/annotation_layers/annotations/commands/delete.py
superset/reports/notifications/base.py
superset/views/dashboard/mixin.py
superset/db_engine_specs/pinot.py
superset/connectors/sqla/models.py
... and 357 more

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