HPCC-30599 Fix file access costs for keyed join #6728

Job	Run time
Check Skip	21s
Build Docker (ubuntu-23.10, pull_request)	8m 46s
Build Docker (ubuntu-22.04, k8s, true, schedule)	16s
Build Docker (ubuntu-22.04, schedule)	47s
Build Bare Metal (ubuntu-20.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	2s
Build Docker (ubuntu-20.04, schedule)	33s
Build Bare Metal (ubuntu-22.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	22m 35s
Build Docker (centos-8, schedule)	44s
Build Bare Metal (windows-2019, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	2s
Build Docker (centos-7, pull_request, -DVCPKG_TARGET_TRIPLET=x64-centos-7-dynamic)	1h 13m 25s
Build Bare Metal (windows-2022, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	14m 3s
Build Docker (amazonlinux, schedule, -DVCPKG_TARGET_TRIPLET=x64-amazonlinux-dynamic)	16s
Build Bare Metal (macos-11, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	3s
Build Docker (centos-7, LN, -DVCPKG_TARGET_TRIPLET=x64-centos-7-dynamic, true, schedule)	14s
Build Bare Metal (macos-12, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	12m 53s
	2h 15m 0s

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