HPCC-31049 fix useConst instances not taking a function #7198

Job	Run time
Check Skip	19s
Build Docker (ubuntu-22.04, k8s, true, schedule)	1m 23s
Build Docker (ubuntu-22.04, schedule)	15s
Build Docker (ubuntu-20.04, schedule)	12s
Build Docker (centos-8, schedule)	13s
Build Bare Metal (ubuntu-20.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	1s
Build Docker (centos-7, pull_request)	26m 38s
Build Bare Metal (ubuntu-22.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	21m 1s
Build Docker (amazonlinux, schedule)	18s
Build Bare Metal (windows-2019, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	3s
Build Docker (centos-7, LN, true, schedule)	13s
Build Bare Metal (windows-2022, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	11m 58s
Build Bare Metal (macos-11, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	2s
Build Bare Metal (macos-12, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	10m 39s
	1h 13m 15s

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