fix: Big Query Edit Form

[hughhhh]

SUMMARY

With new DatabaseModal we aren't able to edit, users are getting a fatal error due to missing encrypted_extra when building the uri

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

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

[hughhhh]

@eschutho @AAfghahi @lyndsiWilliams

[yousoph]

🏷️ 2021.21

[betodealmeida]

[codecov]

Codecov Report

Merging #14850 (5e10341) into master (e466066) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #14850      +/-   ##
==========================================
- Coverage   77.61%   77.53%   -0.08%     
==========================================
  Files         963      963              
  Lines       49246    49247       +1     
  Branches     6197     6197              
==========================================
- Hits        38224    38186      -38     
- Misses      10821    10860      +39     
  Partials      201      201              

Flag	Coverage Δ
hive	81.31% <33.33%> (-0.01%)	⬇️
javascript	72.48% <ø> (ø)
mysql	81.59% <100.00%> (+<0.01%)	⬆️
postgres	81.62% <100.00%> (+<0.01%)	⬆️
presto	?
python	81.99% <100.00%> (-0.15%)	⬇️
sqlite	81.23% <33.33%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
superset/db_engine_specs/bigquery.py	90.15% <ø> (ø)
superset/db_engine_specs/base.py	88.30% <100.00%> (ø)
superset/models/core.py	89.73% <100.00%> (-0.24%)	⬇️
superset/db_engine_specs/presto.py	84.42% <0.00%> (-5.48%)	⬇️
superset/connectors/sqla/models.py	88.33% <0.00%> (-1.43%)	⬇️

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