HPCC-30580 Reduce default max arenas #6420

Job	Run time
Check Skip	24s
Build Bare Metal (ubuntu-20.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	4s
Build Docker (ubuntu-22.10, pull_request)	2m 45s
Build Bare Metal (ubuntu-22.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	43m 37s
Build Docker (ubuntu-22.04, true, schedule)	1m 44s
Build Bare Metal (windows-2019, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	5s
Build Docker (ubuntu-22.04, schedule)	16s
Build Bare Metal (windows-2022, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	24m 24s
Build Docker (ubuntu-20.04, schedule)	57s
Build Bare Metal (macos-11, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	4s
Build Bare Metal (macos-12, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	1h 43m 31s
Build Docker (centos-8, schedule)	12s
Build Docker (centos-7, pull_request)	1h 12m 7s
Build Docker (amazonlinux, schedule)	17s
	4h 10m 27s

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