feat: add affordances for new export functionality

[betodealmeida]

SUMMARY

This was reviewed in #11373 but merged to the wrong branch (not master).

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

See original PR.

TEST PLAN

Tested all the exports manually.

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 #11559 into master will decrease coverage by 4.28%.
The diff coverage is 63.26%.

@@            Coverage Diff             @@
##           master   #11559      +/-   ##
==========================================
- Coverage   66.59%   62.31%   -4.29%     
==========================================
  Files         876      876              
  Lines       42074    42105      +31     
  Branches     3919     3933      +14     
==========================================
- Hits        28021    26239    -1782     
- Misses      13950    15684    +1734     
- Partials      103      182      +79     

Flag	Coverage Δ
cypress	?
javascript	62.58% <63.26%> (-0.02%)	⬇️
python	62.15% <ø> (ø)

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

Impacted Files	Coverage Δ
superset-frontend/src/views/CRUD/utils.tsx	45.88% <0.00%> (-4.12%)	⬇️
superset/config.py	90.15% <ø> (ø)
superset/views/database/views.py	87.43% <ø> (ø)
...tend/src/views/CRUD/data/database/DatabaseList.tsx	79.31% <58.33%> (-2.51%)	⬇️
...perset-frontend/src/views/CRUD/chart/ChartCard.tsx	83.87% <66.66%> (-12.29%)	⬇️
...ontend/src/views/CRUD/data/dataset/DatasetList.tsx	69.23% <66.66%> (-2.74%)	⬇️
...perset-frontend/src/views/CRUD/chart/ChartList.tsx	72.72% <75.00%> (-14.53%)	⬇️
superset-frontend/src/featureFlags.ts	89.47% <100.00%> (-10.53%)	⬇️
superset-frontend/src/SqlLab/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
... and 185 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 6981017...0adcb3f. Read the comment docs.

[mistercrunch]

LGTM