Add admin password reset emails

[Andrew-Dickinson]

Closes #165

[codecov[bot]]

Codecov Report

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

Project coverage is 92.94%. Comparing base (a722da0) to head (7e3dc9a). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #494 +/- ## ========================================== + Coverage 92.90% 92.94% +0.04% ========================================== Files 62 64 +2 Lines 2311 2325 +14 ========================================== + Hits 2147 2161 +14 Misses 164 164 ```

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[Andrew-Dickinson]