Che 7: Theia IDE should be loaded first during workspace startup

[ibuziuk]

Currently Theia IDE starts after all brokers have been pulled and run, all plugins have been pulled and container created. We need to make it faster. We need to have Theia loaded in the user browser first and, in a second step, start all the rest. Something that comes to my mind to achieve this is to create a first k8s deployment with only one pod/container/service (theia) and, after we have started, start a rolling update of it with a new deployment definition that has all the pod/containers/services for the plugins. That's just an idea and I am sure there are other way to achieve that but the goal should be clear: starting a workspace should not take more than starting standalone Theia (5s or so).

More discussions regarding this issue took place in the epic - #1011 (comment)

[ibuziuk]

Closing in favour of eclipse-che/che#14879