Resolve "Assignee dropdown does not display selected assignee"

What does this MR do?

Fixes 2 terrible bugs in multiple assignees dropdown.

  1. Fixes a bug whereby the selected assignee would not show up on the Assignee(s) section because the assignee is not returned in the users api call due to pagination.

  2. Fixes a bug whereby the dropdown is left in a weird state after the dropdown is dismissed after a search is performed.

Are there points in the code the reviewer needs to double check?

Just make sure architecture is good

Why was this MR needed?

Screenshots (if relevant)

Before After
2017-05-24_16.36.41 2017-05-24_16.37.37
Before After
2017-05-24_16.40.48 2017-05-24_16.39.56

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #2472 (closed)

Edited by username-removed-408677

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