style: make <Label/> not uppercase

[mistercrunch]

SUMMARY

Rolling back the change I made that forced all <Label/> to be uppercase. In many cases, labels contain table names, viz type names, filter summary and other things where case matters. We should leave as is by default.

The original intent was to have good vertical alignment of letters inside the label, and having all letters have the same height make things look more even, but I think that doesn't matter much.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

after

before

TEST PLAN

CSS change, so a simple visual review of the application

[codecov-io]

Codecov Report

Merging #11355 into master will decrease coverage by 4.82%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11355      +/-   ##
==========================================
- Coverage   65.76%   60.93%   -4.83%     
==========================================
  Files         838      394     -444     
  Lines       39841    24951   -14890     
  Branches     3655        0    -3655     
==========================================
- Hits        26201    15205   -10996     
+ Misses      13539     9746    -3793     
+ Partials      101        0     -101     

Flag	Coverage Δ
#cypress	?
#javascript	?
#python	60.93% <ø> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...ontend/src/dashboard/components/dnd/handleHover.js
superset-frontend/src/components/ListView/index.ts
...frontend/src/dashboard/actions/dashboardFilters.js
...et-frontend/src/dashboard/containers/Dashboard.jsx
...rontend/src/SqlLab/components/SqlEditorLeftBar.jsx
...frontend/src/dashboard/util/dropOverflowsParent.js
.../src/dashboard/components/UndoRedoKeylisteners.jsx
superset-frontend/src/CRUD/utils.js
...c/dashboard/components/gridComponents/Markdown.jsx
...t-frontend/src/dashboard/components/SliceAdder.jsx
... and 435 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 43aca6a...7fde99b. Read the comment docs.

[villebro]

I prefer this as the default, especially in places where case matters, especially metric aliases etc.

[mistercrunch]

We could re-introduce uppercase in specific places where it makes sense, but unclear where that'd be. Maybe in query status in the query history for instance, but unclear whether it's even worth it.