Current behavior

When the build is initiated by autostart or autostop, the user system/autostart is highlighted with a purple color.

Expected behavior

As per discussion on Slack, we want to update this to gray, same as the member user.

This needs to be updated on both the Workspace page and the Workspace Build page. On the Workspaces page, this was updated in #2968 as we moved the initiator to an avatar.