chore(sqllab): Relocate get bootstrap data logic

[justinpark]

SUMMARY

Part 1 of SQLLab SPA migration: detail link

This commit relocates the existing _get_sqllab_tabs to the utils in sqllab in order to share the same logic in the sqllab api v1 endpoint.
This commit also refactors the defaultDBId by common config parameters which is less relevant to sqlLab root state.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

Go to SQLLab and no errors shown

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

[justinpark]

cc: @EugeneTorap

[codecov]

Codecov Report

Merging #24936 (cd71be1) into master (3458664) will increase coverage by 0.00%.
Report is 2 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head cd71be1 differs from pull request most recent head dd9c589. Consider uploading reports for the commit dd9c589 to get more accurate results

@@           Coverage Diff           @@
##           master   #24936   +/-   ##
=======================================
  Coverage   68.99%   69.00%           
=======================================
  Files        1906     1906           
  Lines       74139    74133    -6     
  Branches     8208     8211    +3     
=======================================
- Hits        51155    51153    -2     
+ Misses      20861    20856    -5     
- Partials     2123     2124    +1     

Flag	Coverage Δ
javascript	55.84% <100.00%> (+0.01%)	⬆️

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

Files Changed	Coverage Δ
...d/src/SqlLab/components/TabbedSqlEditors/index.jsx	50.00% <ø> (ø)
...et-frontend/src/SqlLab/reducers/getInitialState.js	91.66% <ø> (ø)
superset-frontend/src/dashboard/actions/hydrate.js	2.04% <ø> (ø)
...et-frontend/src/dashboard/components/SaveModal.tsx	39.28% <ø> (ø)
superset/databases/api.py	89.95% <ø> (ø)
superset/sqllab/utils.py	100.00% <ø> (ø)
superset/views/base.py	73.24% <ø> (ø)
superset/views/core.py	68.32% <ø> (-1.08%)	⬇️
superset-frontend/src/SqlLab/actions/sqlLab.js	69.70% <100.00%> (+0.08%)	⬆️
...set-frontend/src/dashboard/util/permissionUtils.ts	88.23% <100.00%> (+1.56%)	⬆️
... and 6 more

... and 1 file with indirect coverage changes

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[EugeneTorap]

Hi @michael-s-molina @john-bodley @villebro! Can you help with this PR?

[michael-s-molina]

To fix the Python Misc CI error, you need to fix the order of the imports in these files:

• superset/views/core.py
• superset/tests/integration_tests/core_tests.py

To fix the import order, just run the pre-commit hook.

[michael-s-molina]

LGTM. Thank you @justinpark!

[EugeneTorap]

Can we merge it?