Decrease the scope of GH perms requested on login

[mbeacom]

Description

The goal of this PR is to reduce the initial permissions we request for users.

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

auth

[codecov]

Codecov Report

Merging #1328 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1328   +/-   ##
=======================================
  Coverage   30.83%   30.83%           
=======================================
  Files         124      124           
  Lines        8738     8738           
  Branches     1146     1146           
=======================================
  Hits         2694     2694           
  Misses       5933     5933           
  Partials      111      111

Impacted Files	Coverage Δ
app/app/settings.py	83.14% <100%> (ø)	⬆️

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[SaptakS]

Nice!!!