Restrict Overleaf auth client to ecl users

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.24%. Comparing base (08dcf2b) to head (85a364e). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #619 +/- ## ========================================== - Coverage 81.26% 81.24% -0.02% ========================================== Files 128 128 Lines 9949 9950 +1 ========================================== - Hits 8085 8084 -1 - Misses 1864 1866 +2 ```

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