Fold function back into only caller

[eileenmcnaughton]

Overview

Fold function back into only caller

Before

This form is the only remaining user of the function - it was already deprecated

After

this adds noisy deprecation & takes a copy for the Membership_Form

Technical Details

I'll do a bit more tidy up to address notices affecting #29889 - but this is a precursor in that it gets the code to a location where it can be edited without touching code that at least has the appearance of being shared code

Comments

Anything else you would like the reviewer to note

[civibot]

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