Make header in CardHeader in center if no description is provided

[jpeng-ms]

Currently, if we don't have a description, we still seem to be allocating the space for it:

I was wondering if we could move header to vertical center if description isn't provided?

https://react.fluentui.dev/?path=/docs/components-card-cardheader--default#default

[marcosmoura]

@jpeng-ms This is something that the component specification didn't cover and even though it is not required in code, it always expects a description. I will talk to the designers and see how can this change be made without it being a breaking change.