feat(iam): allow updating a Member's email

[codecov-commenter]

Codecov Report

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

Project coverage is 71.00%. Comparing base (5bf53e0) to head (3885bc7). Report is 344 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4277 +/- ## ========================================== - Coverage 75.45% 71.00% -4.46% ========================================== Files 202 294 +92 Lines 44323 66028 +21705 ========================================== + Hits 33444 46883 +13439 - Misses 9653 17505 +7852 - Partials 1226 1640 +414 ```

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