[StartWorkspace] Make sure ensureWorkspaceAuth is called

[AlexTugarev]

Today I reopened two workspaces from yesterday which did not make into the IDE, but the workspace pod actually were there and reported readiness. After investigating with @geropl and @akosyakov, we came to the conclusion that the owner token might not have been set during the workspace startup flow, because all of the supervisor request were returned with code 403.

Having a look at the StartWorkspace.tsx reveals that we might need to reiterate on the process ensureWorkspaceAuth is actually called. Cases to consider:

• workspace will be re-opened in a tab in background and browser window get blurred
• a timed-out workspace tab remained in background

[geropl]

Scheduled it.