#7619: add disableLoginTab option to disable automatically opening login tab

[twschiller]

What does this PR do?

• Closes Expose managed storage option to disable SSO flow on initial startup #7619
• Adds a disableLoginTab option to managed storage that prevents the extension from opening a login tab on install and heartbeat
• Login page will still show if the user hits a URL the organization has restricted

Remaining Work

• Add test for installer.ts - the install method currently has 0% coverage: https://app.codecov.io/gh/pixiebrix/pixiebrix-extension/blob/main/src%2Fbackground%2Finstaller.ts#L184

Demo

• See Jest tests

Checklist

• Add tests
• New files added to src/tsconfig.strictNullChecks.json (if possible)
• Designate a primary reviewer: @grahamlangford

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (4df97a6) 72.74% compared to head (5823756) 72.78%.
Report is 2 commits behind head on main.

❗ Current head 5823756 differs from pull request most recent head 57f238f. Consider uploading reports for the commit 57f238f to get more accurate results

Files	Patch %	Lines
src/background/installer.ts	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7627      +/-   ##
==========================================
+ Coverage   72.74%   72.78%   +0.03%     
==========================================
  Files        1224     1224              
  Lines       38127    38133       +6     
  Branches     7171     7173       +2     
==========================================
+ Hits        27737    27756      +19     
+ Misses      10390    10377      -13     

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[github-actions]

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