LoginPage - update LoginMainHeader wrapper to div

[thatblindgeye]

Describe the enhancement or change
Followup to patternfly/patternfly#6928 (comment) where we plan to update the header and footer elements being rendered inside the .pf-v6-c-login__main element to plain div wrappers. These elements lose their semantics when nested within sectioning content like main.

Is this request originating from a Red Hat product team? If so, which ones and is there any sort of deadline for this enhancement?

Any other information?