[saga][epic] Improved openQA for multi-user environments
When multiple and many users use an openQA instance it's often helpful to learn about what others are doing, what can be expected, e.g. when jobs can be expected to start, where to contribute to with test result reviewing, find administration errors, configuration overlap and conflicts.
- Inform openQA webUI users about potential worker class mismatch or long delays
- Guide users from index page onto hot spots, where to start reviewing