Add endpoint to check a users ECA status

This endpoint would use some of the underlying mechanisms to validate the ECA status, given an email address. We should avoid returning the associated user as this could be used to fish for information that is considered GDPR data internally. Instead, we will return empty responses with different codes indicating the state.

1. Status code 200 will represent a user found for email with signed ECA
2. Status code 403 will represent a user found without a signed ECA
3. Status code 404 will represent no found user with given email.

The endpoint for this will be /git/eca/lookup?email=dummy@test.org. This will give us the ability to also use this endpoint to validate by username as well if we want, as well as github username. These combined mechanisms should give us the greatest flexibility when checking ECA status in a secure and anonymous way.

added Enhancement statetodo labels

assigned to @malowe

assigned to @zacharysabourin

unassigned @malowe

added statewip label and removed statetodo label

mentioned in merge request !92 (merged)

added statedone label and removed statewip label

closed

We usually keep issues open until we can validate them live. Your work is done, but we still need to get it live before we can close this :)

Right, sorry! Getting a bit ahead of myself!

reopened

This is now live, did a release earlier than expected. Good work!

closed