fix: Users being able to update datasets across DBs

[hughhhh]

SUMMARY

Fixing issue with uniqueness check whenever a user wants to update dataset that has the same schema and table_name. We added additional parameter in the uniqueness check to make sure the we aren't pointing to the same dataset.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• 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

[codecov]

Codecov Report

Merging #17348 (ebeb351) into master (33a8e87) will decrease coverage by 0.12%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master   #17348      +/-   ##
==========================================
- Coverage   77.14%   77.01%   -0.13%     
==========================================
  Files        1036     1038       +2     
  Lines       55759    56875    +1116     
  Branches     7628     8001     +373     
==========================================
+ Hits        43013    43804     +791     
- Misses      12490    12792     +302     
- Partials      256      279      +23     

Flag	Coverage Δ
hive	81.57% <100.00%> (+0.08%)	⬆️
javascript	71.19% <0.00%> (-0.23%)	⬇️
mysql	81.99% <100.00%> (+0.08%)	⬆️
postgres	82.00% <100.00%> (+0.08%)	⬆️
presto	81.78% <100.00%> (-0.01%)	⬇️
python	82.49% <100.00%> (+0.07%)	⬆️
sqlite	81.67% <100.00%> (+0.08%)	⬆️

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Impacted Files	Coverage Δ
...frontend/src/SqlLab/components/ResultSet/index.tsx	61.48% <0.00%> (ø)
superset/connectors/sqla/models.py	87.97% <ø> (ø)
superset/datasets/dao.py	93.79% <100.00%> (+0.08%)	⬆️
...et-frontend/src/dashboard/actions/sliceEntities.js	9.75% <0.00%> (-3.15%)	⬇️
...tend/src/common/hooks/apiResources/apiResources.ts	93.18% <0.00%> (-1.56%)	⬇️
superset-frontend/src/explore/constants.ts	96.07% <0.00%> (-1.29%)	⬇️
...hboard/components/nativeFilters/FilterBar/state.ts	86.45% <0.00%> (-1.05%)	⬇️
superset/db_engine_specs/presto.py	89.95% <0.00%> (-0.42%)	⬇️
superset-frontend/src/dashboard/actions/hydrate.js	1.56% <0.00%> (-0.15%)	⬇️
superset-frontend/src/constants.ts	100.00% <0.00%> (ø)
... and 23 more

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