HPCC-29657 Produce aggregate stats (e.g. spill, cost) whilst a job is running #6250

Job	Run time
Check Skip	8s
Build Docker (ubuntu-23.04, pull_request)	1h 8m 1s
Build Bare Metal (ubuntu-20.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	2s
Build Docker (ubuntu-22.04, k8s, true, schedule)	2m 0s
Build Bare Metal (ubuntu-22.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	49m 44s
Build Docker (ubuntu-22.04, schedule)	1m 6s
Build Bare Metal (windows-2019, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	6s
Build Docker (ubuntu-20.04, schedule)	11s
Build Bare Metal (windows-2022, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	29m 13s
Build Docker (centos-8, schedule)	1m 19s
Build Bare Metal (macos-11, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	4s
Build Docker (centos-7, pull_request)	51m 8s
Build Bare Metal (macos-12, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	20m 23s
Build Docker (amazonlinux, schedule)	18s
Build Docker (centos-7, LN, true, schedule)	1m 8s
	3h 44m 51s

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