FormGroupLabelHelp: use component="span" and isInline to match core

[adamviktora]

Followup to this comment:
#10016 (comment)

Currently the underlying markup does not match core implementation, we use <button> so Popover can be opened on pressing enter key. We should use component="span" and isInline props to match, but first we have to figure out why Popover is not accessible with enter when using span.

[thatblindgeye]

Closed by #10248