[processor/k8sattributes] Move feature gate k8sattr.rfc3339 to stable… #126

Job	Run time
docker-build	7m 36s
collector-build	7m 5s
supervisor-test	1m 26s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 39s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	4m 26s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 30s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 11s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 56s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	4m 43s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 35s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 28s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	5m 21s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 33s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 18s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 16s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 47s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	6m 2s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 24s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 22s
kubernetes-test	1s
	1h 26m 39s

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