fix: uneven list header padding (#12029)

[michael-s-molina]

SUMMARY

Adjust list header padding.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Closes #12029

@junlincc

TEST PLAN

1 - Go to any major list (charts, dashboards, databases, etc)
2 - Check header padding

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-io]

Codecov Report

Merging #12412 (ee22c4a) into master (078a8a1) will decrease coverage by 4.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12412      +/-   ##
==========================================
- Coverage   66.81%   62.76%   -4.05%     
==========================================
  Files        1015     1015              
  Lines       49544    49530      -14     
  Branches     5080     5080              
==========================================
- Hits        33102    31088    -2014     
- Misses      16312    18233    +1921     
- Partials      130      209      +79     

Flag	Coverage Δ
cypress	?
javascript	60.75% <ø> (ø)
python	64.08% <ø> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
.../src/components/dataViewCommon/TableCollection.tsx	100.00% <ø> (ø)
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/chart/ChartContainer.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/reducers/index.js	0.00% <0.00%> (-100.00%)	⬇️
...et-frontend/src/dashboard/containers/Dashboard.jsx	0.00% <0.00%> (-100.00%)	⬇️
...et-frontend/src/filters/components/Select/types.ts	0.00% <0.00%> (-100.00%)	⬇️
...t-frontend/src/dashboard/containers/SliceAdder.jsx	0.00% <0.00%> (-100.00%)	⬇️
...t-frontend/src/explore/reducers/getInitialState.js	0.00% <0.00%> (-100.00%)	⬇️
... and 195 more

---

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[adam-stasiak]

tested - No issues found

[junlincc]

LGTM, perfect!
After:

Before:

@nytai please take a look since we touched your area.

NOTE⚠️:

• This is only Product and QA approval with NO code reviews
• This approval indicates that all UI changes meet product requirement, no noticeable regression is introduced
• This approval indicates this PR is ready for code reviews

[rusackas]

Code looks good to me. Tempted to do the usual nag about gridUnit, but I don't like fractional gridUnits, so I'll let the 2px go :)

I'd merge this, but would love to have @nytai's nod of approval first :D