357234: Add UI buttons to remove reviewers from change

Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=357234

Change-Id: Iac12676d3b4d817e81274cb8c2e2fc60dc967ae8
Signed-off-by: RileyDavidson <rd12hq@brocku.ca>
12 files changed