Allows running Che 7 workspace without any user environment but with Che 7 tooling set.
Workspace without environment has an empty list of environments and null value in `defaultEnv` field.
Field `activeEnv` is supposed to be `null` too.
What is changed:
- Migration of DB
- make defaultEnv nullable
- remove env_name from runtimes primary key
- make env_name in runtimes nullable
- Make code respect the fact that there are workspaces with no env
- settings API that returns the list of supported environment types returns no-environment type that - indicates that infrastructure support workspace with no environment at all.
Signed-off-by: Oleksandr Garagatyi <ogaragat@redhat.com>
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