fix(explore): make sure sort by metric is not duplicated

[ktmud]

SUMMARY

Closes #13423

#13057 Added sortby metrics for some multi-series charts but it causes duplicate metrics and wrong queries.

This is a bandaid PR to quickly fix the issue from the surface. I'm making the handling of sort by metrics more robust in #13434 .

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before

After

TEST PLAN

1. Go to a Area chart
2. Add a metric and a sort by metric of the same name

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 #13473 (7f80b8a) into master (9fc03f0) will decrease coverage by 5.84%.
The diff coverage is 10.00%.

@@            Coverage Diff             @@
##           master   #13473      +/-   ##
==========================================
- Coverage   77.44%   71.60%   -5.85%     
==========================================
  Files         906      804     -102     
  Lines       45721    40629    -5092     
  Branches     5449     4159    -1290     
==========================================
- Hits        35410    29093    -6317     
- Misses      10184    11536    +1352     
+ Partials      127        0     -127     

Flag	Coverage Δ
cypress	57.95% <ø> (+0.04%)	⬆️
hive	?
javascript	?
mysql	80.36% <10.00%> (+<0.01%)	⬆️
postgres	80.40% <10.00%> (+<0.01%)	⬆️
presto	80.06% <10.00%> (+<0.01%)	⬆️
python	80.63% <10.00%> (-0.27%)	⬇️
sqlite	80.02% <10.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset/viz.py	56.10% <10.00%> (+0.09%)	⬆️
...uperset-frontend/src/dashboard/util/dnd-reorder.js	0.00% <0.00%> (-100.00%)	⬇️
...rset-frontend/src/dashboard/util/getEmptyLayout.js	0.00% <0.00%> (-100.00%)	⬇️
...et-frontend/src/components/Pagination/Ellipsis.tsx	0.00% <0.00%> (-100.00%)	⬇️
...-frontend/src/components/OmniContainer/Omnibar.tsx	0.00% <0.00%> (-100.00%)	⬇️
...frontend/src/components/ErrorMessage/IssueCode.tsx	0.00% <0.00%> (-100.00%)	⬇️
...rc/components/ErrorMessage/TimeoutErrorMessage.tsx	0.00% <0.00%> (-100.00%)	⬇️
...dashboard/components/resizable/ResizableHandle.jsx	0.00% <0.00%> (-100.00%)	⬇️
...tersConfigModal/Footer/CancelConfirmationAlert.tsx	0.00% <0.00%> (-100.00%)	⬇️
...ConfigModal/FiltersConfigForm/FilterScope/state.ts	0.00% <0.00%> (-100.00%)	⬇️
... and 481 more

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[villebro]

LGTM, thanks for fixing