chore: remove supersetTheme with withTheme

[pkdotson]

SUMMARY

This pr removes the supersetTheme with withTheme component.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

before

Screen.Recording.2021-10-11.at.9.40.39.PM.mov

after
https://user-images.githubusercontent.com/17326228/136892210-bea4877b-8166-4714-9753-64e92af57b23.mov

TESTING INSTRUCTIONS

Go to any chart and go to the datasource panel and click on edit datasource. Check modal looks identical to original.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #17069 (23c5ed3) into master (cd9e994) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #17069      +/-   ##
==========================================
+ Coverage   76.91%   77.00%   +0.09%     
==========================================
  Files        1039     1038       -1     
  Lines       55566    55612      +46     
  Branches     7570     7585      +15     
==========================================
+ Hits        42738    42824      +86     
+ Misses      12578    12538      -40     
  Partials      250      250              

Flag	Coverage Δ
javascript	71.13% <100.00%> (+0.19%)	⬆️

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

Impacted Files	Coverage Δ
...end/src/components/Datasource/DatasourceEditor.jsx	76.09% <100.00%> (+3.98%)	⬆️
...erset-frontend/src/components/Pagination/index.tsx	72.72% <0.00%> (-27.28%)	⬇️
...nativeFilters/FiltersConfigModal/Footer/Footer.tsx	90.90% <0.00%> (-9.10%)	⬇️
...frontend/src/dashboard/components/Header/index.jsx	68.30% <0.00%> (-0.41%)	⬇️
...et-frontend/src/components/TableSelector/index.tsx	74.28% <0.00%> (-0.25%)	⬇️
...frontend/src/components/DatabaseSelector/index.tsx	95.00% <0.00%> (-0.13%)	⬇️
...tersConfigModal/FiltersConfigForm/ColumnSelect.tsx	96.07% <0.00%> (-0.08%)	⬇️
...frontend/src/components/TimezoneSelector/index.tsx	97.72% <0.00%> (-0.06%)	⬇️
superset-frontend/src/views/menu.tsx	0.00% <0.00%> (ø)
...et-frontend/src/filters/components/Select/types.ts	100.00% <0.00%> (ø)
... and 33 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 cd9e994...23c5ed3. Read the comment docs.