fix: Allow for updates on Step 3

[hughhhh]

SUMMARY

Once creating a DB via dynamic form, we wouldn't allow for updating after finish. Update the Finish command to do an update once the user is done editing.

Also fixed the edit issue with bigquery engines on sqla forms, user's can now see secure extra fields

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

1. Create a DB
2. Add values to step 3
3. Click Finish
4. Make sure the value stay

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

[codecov]

Codecov Report

Merging #15512 (d6e8f44) into pexdax/db-connection-ui (1a16c49) will decrease coverage by 0.23%.
The diff coverage is 66.66%.

@@                     Coverage Diff                     @@
##           pexdax/db-connection-ui   #15512      +/-   ##
===========================================================
- Coverage                    77.25%   77.02%   -0.24%     
===========================================================
  Files                          975      975              
  Lines                        50882    50884       +2     
  Branches                      6740     6740              
===========================================================
- Hits                         39307    39191     -116     
- Misses                       11359    11477     +118     
  Partials                       216      216              

Flag	Coverage Δ
hive	?
mysql	81.65% <100.00%> (+<0.01%)	⬆️
postgres	81.67% <100.00%> (+<0.01%)	⬆️
presto	?
python	81.75% <100.00%> (-0.45%)	⬇️
sqlite	81.28% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
.../database/DatabaseModal/DatabaseConnectionForm.tsx	48.48% <ø> (ø)
...c/views/CRUD/data/database/DatabaseModal/index.tsx	75.32% <50.00%> (ø)
superset/databases/api.py	93.23% <100.00%> (+0.04%)	⬆️
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.20% <0.00%> (-17.21%)	⬇️
superset/db_engine_specs/presto.py	83.36% <0.00%> (-6.95%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/connectors/sqla/models.py	88.22% <0.00%> (-1.65%)	⬇️
superset/db_engine_specs/base.py	88.14% <0.00%> (-0.40%)	⬇️
superset/models/core.py	89.76% <0.00%> (-0.27%)	⬇️
... and 3 more

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