[chore] remove toolchain directive #27785

Job	Run time
collector-build	5m 15s
docker-build	5m 21s
supervisor-test	1m 16s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 36s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	3m 11s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 15s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 45s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	5m 40s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	3m 19s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 40s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 32s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	4m 55s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	3m 20s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 40s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 14s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	5m 6s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	3m 39s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 17s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	4m 1s
kubernetes-test	1s
	1h 18m 3s

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