chore: Removes unused Hotkeys component

[michael-s-molina]

SUMMARY

Removes unused Hotkeys component

Hotkeys were removed in #12008 with the following comment from @rusackas:

Heya... I took those out. At least for me, most of them don't actually work, so I figured it wouldn't be missed.

We can certainly put it back in if it's a big deal, but I'd rather design/implement a more global keyboard shortcut helper, e.g. hover/click a global item, and all the bits of UI with keyboard shortcuts light up. For example, the Run button would get a little ctrl-r tooltip next to it.

Since the component wasn't being used I removed it.

TEST PLAN

1 - Execute all tests
2 - All tests should pass

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]

Codecov Report

Merging #13408 (c087b0d) into master (f19a830) will decrease coverage by 3.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #13408      +/-   ##
==========================================
- Coverage   76.33%   73.10%   -3.23%     
==========================================
  Files         900      598     -302     
  Lines       45596    21132   -24464     
  Branches     5491     5489       -2     
==========================================
- Hits        34804    15448   -19356     
+ Misses      10648     5557    -5091     
+ Partials      144      127      -17     

Flag	Coverage Δ
cypress	57.95% <ø> (-0.85%)	⬇️
hive	?
javascript	62.80% <ø> (+0.04%)	⬆️
mysql	?
postgres	?
presto	?
python	?
sqlite	?

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

Impacted Files	Coverage Δ
...erset-frontend/src/SqlLab/components/ResultSet.tsx	68.46% <0.00%> (-0.31%)	⬇️
superset/examples/flights.py
superset/models/helpers.py
superset/db_engine_specs/gsheets.py
superset/utils/url_map_converters.py
superset/css_templates/filters.py
superset/annotation_layers/commands/create.py
superset/dashboards/schemas.py
superset/views/schedules.py
superset/connectors/sqla/__init__.py
... and 352 more

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[rusackas]

We have the technology to bring it back.