test: Adds storybook to Timer component

[michael-s-molina]

SUMMARY

• Adds storybook to Timer component
• Moves Timer component to own folder
• Moves Timer tests to component's folder

TEST PLAN

1 - Execute Timer tests
2 - All tests should pass

@rusackas @junlincc

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 #13343 (cf12951) into master (d39bc14) will increase coverage by 0.42%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #13343      +/-   ##
==========================================
+ Coverage   72.26%   72.69%   +0.42%     
==========================================
  Files         876      577     -299     
  Lines       45409    21027   -24382     
  Branches     5440     5441       +1     
==========================================
- Hits        32815    15285   -17530     
+ Misses      12384     5619    -6765     
+ Partials      210      123      -87     

Flag	Coverage Δ
cypress	58.16% <ø> (?)
hive	?
javascript	62.28% <0.00%> (+0.01%)	⬆️
mysql	?
postgres	?
presto	?
python	?
sqlite	?

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Impacted Files	Coverage Δ
...erset-frontend/src/SqlLab/components/ResultSet.tsx	68.98% <ø> (-0.33%)	⬇️
...rset-frontend/src/components/DeleteModal/index.tsx	100.00% <ø> (ø)
...et-frontend/src/components/Timer/Timer.stories.tsx	0.00% <0.00%> (ø)
superset-frontend/src/components/Timer/index.tsx	95.83% <ø> (ø)
...ontend/src/components/URLShortLinkButton/index.jsx	100.00% <ø> (ø)
...et-frontend/src/messageToasts/components/Toast.tsx	92.68% <ø> (+4.87%)	⬆️
superset-frontend/src/views/routes.tsx	56.81% <0.00%> (-6.82%)	⬇️
...rontend/src/explore/components/DatasourcePanel.tsx	76.00% <0.00%> (-3.17%)	⬇️
...-frontend/src/datasource/ChangeDatasourceModal.tsx	84.33% <0.00%> (-1.03%)	⬇️
...t-frontend/src/views/CRUD/welcome/SavedQueries.tsx	62.50% <0.00%> (-0.66%)	⬇️
... and 512 more

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