fix(material/formfield): Correct label position problem with outline appearance inside material tabs

[kharazian]

This change helps with an issue when you have a form field with an outline appearance placed inside a material tab. When the form field has an outline, the label does not show up properly. By adding some space at the top when the form field has an outline, we can make sure the label is not cut off.

Fixes #27764

[mmalerba]

We can presubmit this and see how it goes, but I remember trying to make a change like this in the past and it messed up the layout in a lot of apps. If it winds up being too difficult to land, my advice would be to just put some padding in your tab content area

[mmalerba]

@kharazian looks like there's a missing sass @use (see the CI failures)

[andrewseguin]

Closing since its part of our guidelines not to add spacing around a top element: https://github.com/angular/components/blob/main/CODING_STANDARDS.md#never-set-a-margin-on-a-host-element

It would make sense, since the label extends above it and can be clipped, but it's fairly uncommon for a form field to be that close to a container edge and not have the option to just add manual padding

Also, this change would be super-breaking for everyone

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