Contract start and end dates are never synced by SCIM, so they
should remain editable even when a profile is SCIM-managed.
The backend now skips overwriting SCIM-synced fields (fullName,
kind, position, additionalEmailAddresses) for SCIM profiles,
and the frontend disables only those fields instead of the
entire form.
Signed-off-by: Bryan Frimin <bryan@getprobo.com>