Remove unnecessary IsAuthenticated permission classses

[Oksamies]

Current dependencies on/for this PR:

• master
  • PR #953
  • PR #954 👈

This stack of pull requests is managed by Graphite.

[codecov[bot]]

Codecov Report

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

Comparison is base (752d812) 92.64% compared to head (cb384f2) 92.63%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 12-13-Make_all_DRF_endpoints_require_Auth_by_default #954 +/- ## ======================================================================================== - Coverage 92.64% 92.63% -0.02% ======================================================================================== Files 278 278 Lines 8325 8312 -13 Branches 776 776 ======================================================================================== - Hits 7713 7700 -13 Misses 506 506 Partials 106 106 ```

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