Move result type from Belt to built-in. #2928

Job	Run time
static-binaries-linux (ubuntu-latest)	2m 4s
static-binaries-linux (buildjet-2vcpu-ubuntu-2204-arm)	2m 13s
build (macos-latest, 4.14.0)	17m 28s
upload-linux-arm64-binaries	24s
build (ubuntu-latest, 4.14.0)	8m 34s
build (windows-latest, 4.14.0)	17m 5s
build (macos-arm, 4.14.0)	6m 24s
package	1m 21s
installationTest (macos-latest)	34s
installationTest (macos-arm)	19s
installationTest (ubuntu-latest)	11s
installationTest (buildjet-2vcpu-ubuntu-2204-arm)	19s
installationTest (windows-latest)	1m 23s
publish	0s
	58m 19s

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