[REF] Cleanup custom field handling... twice

[colemanw]

Overview

What should have been a minor code cleanup, but in two places ☹️

Technical Details

Yes, this is exactly the same code in two places.

Comments

Part of me died inside when I saw this.

[civibot]

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[pradpnayak]

Looks good to me but do we need to move the duplicate code into separate function? Anyways its good to merge!

[colemanw]

Yes, there is a lot of cleanup to do. It would be simple enough to consolidate these two chunks of copy/paste, but, one of them is in DeprecatedUtils so already needs to be removed. And the other is in an Import class. There are 5 of those, and they all basically copy/paste each other, so what's really needed is to move custom data parsing out of the 5 separate CRM_*_Import_Parser classes and into their shared parent CRM_Import_Parser.
If you'd like to help with any of that, yes please!