APIv4 - entityBatch linkage
This comes from discussion here https://github.com/civicrm/civicrm-core/pull/20505
The issue is that to make it usable in search kit we need a pseudoconstant for what is allowed for 'entity_table'
In core I think this is ONLY civicrm_financial_trxn. However, gift-aid also added civicrm_contribution
My best idea at the moment is to use an option group (and create a PR against giftaid to add it + use release notes & dev-digest)