Remove or adjust Prebuild status in the Prebuild page header (now duplicates the bottom status)

[jankeromnes]

Follow-up to #5474:

#5474 (comment)

question: Now that we have proper status updates down here and this component is used as is in the project configurator, wondering if it makes sense to change or remove the status from the header although it could be useful to have the status up there.

If we remove the header instance we'll have to make sure the bottom part of the prebuild output is always visible. Of course, we could leave it as is for now but make sure the designs for both is identical. Alternatively, we could only include the status icon to avoid having duplicated information. What do you think?

BEFORE	AFTER (A)	AFTER (B)

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Also, the top status is based on the prebuild (PrebuiltWorkspaceState), while the bottom status is based on the instance (WorkspaceInstancePhase).

Normally, the two should always be in sync, but it can happen that they disagree (e.g. because of incidents or bugs), which can be very confusing and looks bad:

#5474 (comment)

issue: Noticed that the status on the header section does not automatically get updated but you need to reload to the get new status. This could lead to having a discrepancy between these two places where status is surfaced.

Example A	Example B

Thus, having only one status in this page makes even more sense.