fix: sorting by saved metric

[villebro]

SUMMARY

Currently ordering by saved metrics will cause queries to fail on the SQLAlchemy model. This PR:

• Add support for using saved metrics for sorting in SQLAlchemy model.
• Use same sorting key for Girls and Boys example tables.

BEFORE

AFTER

TEST PLAN

Local testing

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 #13059 (b4fc2d6) into master (2ce7982) will increase coverage by 13.95%.
The diff coverage is 76.31%.

@@             Coverage Diff             @@
##           master   #13059       +/-   ##
===========================================
+ Coverage   53.06%   67.01%   +13.95%     
===========================================
  Files         489      489               
  Lines       17314    28782    +11468     
  Branches     4482        0     -4482     
===========================================
+ Hits         9187    19288    +10101     
- Misses       8127     9494     +1367     

Flag	Coverage Δ
cypress	?
python	67.01% <76.31%> (?)

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

Impacted Files	Coverage Δ
superset/config.py	90.64% <ø> (ø)
superset/examples/birth_names.py	73.19% <ø> (ø)
...s/260bf0649a77_migrate_x_dateunit_in_time_range.py	0.00% <0.00%> (ø)
superset/charts/commands/exceptions.py	92.85% <77.77%> (ø)
superset/db_engine_specs/elasticsearch.py	89.74% <93.75%> (ø)
superset/connectors/sqla/models.py	84.55% <100.00%> (ø)
superset/utils/date_parser.py	96.87% <100.00%> (ø)
superset-frontend/src/utils/parseCookie.ts
...rset-frontend/src/components/URLShortLinkModal.tsx
...ntend/src/dashboard/util/activeDashboardFilters.js
... and 966 more

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[betodealmeida]

LGTM