Expose a new variable `JETBRAINS_GITPOD_WORKSPACE_HOST` on Supervisor Info endpoint

[felladrin]

We are going to change host for ssh, so let's go with JETBRAINS_GITPOD_WORKSPACE_HOST to control it.

You can get host from

gitpod/components/supervisor-api/info.proto

Line 74 in 612041c

string workspace_url = 12;

You can access info here

gitpod/components/ide/jetbrains/image/status/main.go

Line 69 in 612041c

contentStatus, wsInfo, err := resolveWorkspaceInfo(context.Background())

And set as an env var here:

gitpod/components/ide/jetbrains/image/status/main.go

Line 229 in 612041c

cmd.Env = append(cmd.Env, "CWM_HOST_STATUS_OVER_HTTP_TOKEN=gitpod")

Originally posted by @akosyakov in #9733 (comment)