Exit validator check

[sparrowDom]

Add a check that the minimal activation period elapsed before being allowed to exit a validator

[codecov[bot]]

Codecov Report

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

Project coverage is 61.86%. Comparing base (7ba5a5d) to head (be406ca).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2112 +/- ## ======================================== Coverage 61.86% 61.86% ======================================== Files 66 66 Lines 3322 3322 Branches 649 863 +214 ======================================== Hits 2055 2055 Misses 1264 1264 Partials 3 3 ```

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