Issue #3592461: Set default member type confirmation format

tribekkrequested to merge
issue/conreg-3592461:3592461-set-default-format into 1.x

closes #3592461

sets a fallback text format for member type confirmation override bodies when existing configuration has no format. the subject and body fields are hidden until override is selected.

checked locally:

  • php lint on MemberTypes.php and FormBuildTest.php
    • composer validate --no-check-publish
    • git diff --check

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