fix: Restrict deactivated enterprise user access

[suejung-sentry]

Restrict what deactivated Enterprise users can see when the environment has guest access turned off.

• If guest access if off, deactivated users should not be able to see anything
• If guest access is on, deactivated users should be able to see public repos, but not private repos

Closes codecov/engineering-team#1859

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.02%. Comparing base (ad92471) to head (603baed).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #910   +/-   ##
=======================================
  Coverage   96.02%   96.02%           
=======================================
  Files         828      828           
  Lines       19444    19447    +3     
=======================================
+ Hits        18671    18674    +3     
  Misses        773      773           

Flag	Coverage Δ
unit	92.30% <100.00%> (+<0.01%)	⬆️
unit-latest-uploader	92.30% <100.00%> (+<0.01%)	⬆️

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[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[ajay-sentry]

lgtm!

[github-actions]

✅ All tests successful. No failed tests were found.

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