[cbuild-run] Implement extensions (`system-resources`, `debug-vars`, `debuggers`) #783

Job	Run time
setup / config	1s
matrix_prep / matrix_prep	10s
test_libs (macos-13, darwin, amd64, publicRepo)	8m 28s
test_libs (macos-14, darwin, arm64, publicRepo)	2m 22s
test_libs (ubuntu-22.04, linux, amd64, always)	7m 43s
test_libs (ubuntu-22.04, linux, arm64, always)	3m 1s
test_libs (windows-2019, windows, amd64, always)	11m 14s
test_libs (windows-2019, windows, arm64, always)	4m 56s
Publish Tests Results	2s
	37m 57s

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