Refs: https://openscience.atlassian.net/browse/LEI-
Companion to: 

## Purpose


## Summary of changes


## Testing notes


Refs: https://openscience.atlassian.net/browse/LEI-

## Purpose


## Summary of changes


## Testing notes


Remove field from pull template
Remove field from pull template

We're not actively developing experimenter across repos as much these days, so this field isn't as useful anymore.

[#LEI-236]
