feat: update covid dashboard

[eschutho]

SUMMARY

This updates the covid dashboard with more recent data, and also renames some datasets.

The underlying data in this dataset has been updated. Do get those updates, you'll need to run superset load-examples -f. The dashboard changes in the PR will continue to work with the existing data as well.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

check that the new dashboards and datasets are working properly

ADDITIONAL INFORMATION

• Has associated issue:
• 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

[betodealmeida]

LGTM

[codecov]

Codecov Report

Merging #16183 (305321c) into master (3f86a54) will decrease coverage by 0.21%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #16183      +/-   ##
==========================================
- Coverage   76.83%   76.62%   -0.22%     
==========================================
  Files         996      996              
  Lines       53025    53020       -5     
  Branches     6748     6748              
==========================================
- Hits        40742    40624     -118     
- Misses      12057    12170     +113     
  Partials      226      226              

Flag	Coverage Δ
hive	?
mysql	81.61% <0.00%> (+0.01%)	⬆️
postgres	81.63% <0.00%> (+0.05%)	⬆️
presto	?
python	81.72% <0.00%> (-0.42%)	⬇️
sqlite	81.27% <0.00%> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
superset/examples/energy.py	26.19% <0.00%> (ø)
superset/examples/world_bank.py	30.55% <0.00%> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.80% <0.00%> (-16.87%)	⬇️
superset/db_engine_specs/presto.py	83.47% <0.00%> (-6.91%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/connectors/sqla/models.py	88.03% <0.00%> (-1.66%)	⬇️
superset/db_engine_specs/base.py	87.98% <0.00%> (-0.39%)	⬇️
superset/models/core.py	89.61% <0.00%> (-0.26%)	⬇️
superset/utils/core.py	88.72% <0.00%> (-0.13%)	⬇️
... and 1 more

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