HPCC-30972 ECL Watch fix webpack dev server #7003

Job	Run time
Check Skip	6s
Build Docker (ubuntu-22.04, k8s, true, schedule)	1m 16s
Build Docker (ubuntu-22.04, schedule)	15s
Build Bare Metal (ubuntu-20.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	2s
Build Docker (ubuntu-20.04, schedule)	1m 14s
Build Bare Metal (ubuntu-22.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	21m 7s
Build Docker (centos-8, schedule)	1m 13s
Build Bare Metal (windows-2019, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	5s
Build Docker (centos-7, pull_request)	25m 35s
Build Bare Metal (windows-2022, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	14m 34s
Build Docker (amazonlinux, schedule)	1m 12s
Build Docker (centos-7, LN, true, schedule)	16s
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...	11m 14s
	1h 18m 13s

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