Show list of feedback requests sent to logged-in user on existing "Give Feedback" page.

[chazkii]

Currently, the only method to keep track of feedback requests is to keep track of emails sent out on creation of the request. This is prone to loss of feedback, because emails can get lost amongst the noise.

The proposed solution to this is:

• On the existing "Give Feedback" page, which shows a table of nominees, we would add a table above this that will show the specific requests sent to the logged in user.

[chazkii]

Tested this as of HEAD today (2020-04-05), this already works for external users that have been requested feedback. But we use the existing enrollees field to populate. Need to add another field such as requesters for explicit invites. If I wanted to take this up a notch, for the "Request feedback" page, we could auto-complete from LDAP. Periodically cache LDAP results once a day for quick retrieval.