Experiment: remove Belt from compiler repo #2976

Job	Run time
static-binaries-linux (ubuntu-latest)	2m 1s
static-binaries-linux (buildjet-2vcpu-ubuntu-2204-arm)	2m 39s
upload-linux-arm64-binaries	23s
build (macos-latest, 4.14.0)	15m 17s
build (ubuntu-latest, 4.14.0)	9m 31s
build (windows-latest, 4.14.0)	14m 33s
build (macos-arm, 4.14.0)	5m 30s
package	1m 52s
installationTest (macos-latest)	21s
installationTest (macos-arm)	14s
installationTest (ubuntu-latest)	14s
installationTest (buildjet-2vcpu-ubuntu-2204-arm)	40s
installationTest (windows-latest)	1m 5s
publish	0s
	54m 20s

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