other(revert): "fix: the calculated columns explicit type convert into date"

[john-bodley]

This PR reverts #14813 as there should be no need for type inferencing—which could be incorrect—given that the type of the calculated column should be set in the same modal—exposed if one scrolls.

Note the widget also allows for user entered types, i.e, they're not restricted to only the pre-defined four options.

[codecov]

Codecov Report

Merging #16950 (e7460fd) into master (792efef) will decrease coverage by 0.21%.
The diff coverage is 100.00%.

❗ Current head e7460fd differs from pull request most recent head d47b34c. Consider uploading reports for the commit d47b34c to get more accurate results

@@            Coverage Diff             @@
##           master   #16950      +/-   ##
==========================================
- Coverage   76.96%   76.74%   -0.22%     
==========================================
  Files        1038     1038              
  Lines       55612    55611       -1     
  Branches     7590     7590              
==========================================
- Hits        42800    42678     -122     
- Misses      12562    12683     +121     
  Partials      250      250              

Flag	Coverage Δ
hive	?
mysql	81.93% <100.00%> (-0.01%)	⬇️
postgres	81.94% <100.00%> (-0.01%)	⬇️
presto	?
python	82.03% <100.00%> (-0.42%)	⬇️
sqlite	81.62% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
superset/connectors/sqla/models.py	85.83% <100.00%> (-1.66%)	⬇️
superset/db_engines/hive.py	0.00% <0.00%> (-85.19%)	⬇️
superset/db_engine_specs/hive.py	69.76% <0.00%> (-17.06%)	⬇️
superset/db_engine_specs/presto.py	83.47% <0.00%> (-6.91%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/models/core.py	89.26% <0.00%> (-0.74%)	⬇️
superset/db_engine_specs/base.py	88.20% <0.00%> (-0.39%)	⬇️
superset/utils/core.py	90.02% <0.00%> (-0.12%)	⬇️

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[villebro]

LGTM, as fully fixing this is far outside the scope of this (or the reverted) PR