KF, KfField.h: unused function FieldBase::MakeFieldRegion is removed

Merge request to support the refs #3440.

It removes unused functions MakeFieldRegion() from the FieldBase class specializations.

added BugFix KF labels

requested review from @se.gorbunov

assigned to @se.gorbunov

approved this merge request

Dear @d.smith, @fweig,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

merged