refactor: split db modal file

[eschutho]

SUMMARY

This change sets us up to switch between tabs and screens in the next iteration of the new db connection ui flow.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

The only change visually is the title and button on Create/Connect a database

TEST PLAN

Tests should all pass

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 #14436 (a8d1ec8) into master (77d1715) will increase coverage by 0.17%.
The diff coverage is 70.86%.

❗ Current head a8d1ec8 differs from pull request most recent head 9f0c55b. Consider uploading reports for the commit 9f0c55b to get more accurate results

@@            Coverage Diff             @@
##           master   #14436      +/-   ##
==========================================
+ Coverage   76.79%   76.96%   +0.17%     
==========================================
  Files         955      957       +2     
  Lines       48251    48114     -137     
  Branches     6030     6045      +15     
==========================================
- Hits        37053    37032      -21     
+ Misses      11003    10883     -120     
- Partials      195      199       +4     

Flag	Coverage Δ
javascript	71.64% <71.65%> (+0.33%)	⬆️

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

Impacted Files	Coverage Δ
...rset-frontend/src/SqlLab/components/QueryTable.jsx	66.66% <ø> (ø)
superset-frontend/src/SqlLab/reducers/sqlLab.js	34.95% <ø> (ø)
superset-frontend/src/chart/Chart.jsx	50.00% <ø> (+5.93%)	⬆️
superset-frontend/src/chart/ChartContainer.jsx	100.00% <ø> (ø)
superset-frontend/src/dashboard/actions/hydrate.js	3.30% <0.00%> (-0.06%)	⬇️
...ters/FiltersConfigModal/FiltersConfigForm/state.ts	100.00% <ø> (ø)
...set-frontend/src/dashboard/containers/Dashboard.ts	0.00% <0.00%> (ø)
superset-frontend/src/dashboard/reducers/types.ts	0.00% <ø> (ø)
...nd/src/dashboard/util/activeAllDashboardFilters.ts	92.59% <0.00%> (-0.27%)	⬇️
superset-frontend/src/dataMask/types.ts	100.00% <ø> (ø)
... and 99 more

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[hughhhh]

/testenv up

[github-actions]

@hughhhh Ephemeral environment spinning up at http://54.213.153.117:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[lyndsiWilliams]

I checked the ephemeral environment, it all looks good to me!

[github-actions]

Ephemeral environment shutdown and build artifacts deleted.