fix(issues): use AssigneeIDValue for ListProjectIssuesOptions.AssigneeID

Clayton Carterrequested to merge
claytonrcarter/client-go:crc/project-issue-list into release-client-1.0

This is the same fix as was applied to group issues back in !2234 (merged).

Docs: https://docs.gitlab.com/api/issues/#list-project-issues

Return issues assigned to the given user id. Mutually exclusive with assignee_username. None returns unassigned issues. Any returns issues with an assignee.

(This is my first contribution here, and I don't do very much go, so please let me know if/what needs to be improved on this!)

Ref: !2234 (merged) Ref: 08416a77

Edited by Clayton Carter

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