APIv4 - Support pseudoconstant suffixes in getFields

[colemanw]

Overview

This builds on the work done in #16154 to allow values in getFields to contain pseudoconstant suffixes.

Before

The APIv4 Explorer allows you to choose values with suffixes... but it doesn't work.

After

Now it does.

[civibot]

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[eileenmcnaughton]

@colemanw how can I r-run this?

[colemanw]

[eileenmcnaughton]

Thanks - I was able to replicate this in r-run - merging