[WIP] refactor: replace "csv" with "file" used in common (excel) upload cases

[cemremengu]

This is just the tip of the iceberg. allow_csv_upload is almost everywhere in codebase including the database. Not sure the effects of renaming that. If someone can assist me in creating a db migration I can also do that.

ADDITIONAL INFORMATION

• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.

[codecov]

Codecov Report

Merging #13805 (73e8901) into master (e61f5a9) will decrease coverage by 0.14%.
The diff coverage is 77.77%.

❗ Current head 73e8901 differs from pull request most recent head d64d701. Consider uploading reports for the commit d64d701 to get more accurate results

@@            Coverage Diff             @@
##           master   #13805      +/-   ##
==========================================
- Coverage   77.51%   77.37%   -0.15%     
==========================================
  Files         934      934              
  Lines       47250    47250              
  Branches     5881     5881              
==========================================
- Hits        36628    36560      -68     
- Misses      10478    10546      +68     
  Partials      144      144              

Flag	Coverage Δ
cypress	56.02% <ø> (-0.03%)	⬇️
hive	?
mysql	80.58% <77.77%> (ø)
postgres	80.61% <77.77%> (ø)
presto	80.28% <77.77%> (+0.13%)	⬆️
python	80.86% <77.77%> (-0.12%)	⬇️
sqlite	80.17% <77.77%> (ø)

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

Impacted Files	Coverage Δ
superset/views/database/forms.py	88.88% <0.00%> (ø)
superset/models/core.py	89.37% <100.00%> (ø)
superset/views/core.py	75.62% <100.00%> (ø)
superset/views/database/validators.py	84.21% <100.00%> (ø)
superset/views/database/views.py	87.56% <100.00%> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	74.23% <0.00%> (-16.54%)	⬇️
...et-frontend/src/dashboard/components/Dashboard.jsx	85.26% <0.00%> (-4.22%)	⬇️
superset/db_engine_specs/presto.py	88.70% <0.00%> (+0.41%)	⬆️

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[villebro]

Closing this PR, as this work has already been implemented in #16756