chore: verify SLSA token at creation #5441

Job	Run time
build / detect-env	3s
build-continue-invalid-subjects / detect-env	2s
build-continue-no-error / detect-env	4s
build / generator	1m 33s
build-continue-invalid-subjects / generator	1m 36s
build-continue-no-error / generator	1m 31s
build-continue-no-error / upload-assets	0s
build-continue-no-error / final	1s
build / upload-assets	0s
build / final	1s
build-continue-invalid-subjects / upload-assets	0s
build-continue-invalid-subjects / final	1s
verify generic provenance (continue-on-error)	7s
verify generic provenance	7s
verify generic provenance (continue-on-error invalid subjects)	7s
	5m 13s

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