[Test][KubeRay] Add doctests for Kuberay Autoscaling (#51884)

Signed-off-by: jiangjiawei1103 <waynechuang97@gmail.com>

Author: JiangJiaWei1103

doc/source/cluster/kubernetes/doc_sanitize.cfg

@@ -6,10 +6,18 @@ replace: KUBERAY-OPERATOR-POD-NAME
 regex: raycluster-kuberay-workergroup-worker-[a-z0-9]{5}
 replace: RAYCLUSTER-HEAD-POD-NAME
 
+[raycluster-autoscaler-head-pod-name]
+regex: raycluster-autoscaler-head-[a-z0-9]{5}
+replace: RAYCLUSTER-AUTOSCALER-HEAD-POD-NAME
+
 [raycluster-worker-pod-name]
 regex: raycluster-kuberay-head-[a-z0-9]{5}
 replace: RAYCLUSTER-WORKER-POD-NAME
 
+[raycluster-autoscaler-small-group-worker-pod-name]
+regex: raycluster-autoscaler-small-group-worker-[a-z0-9]{5}
+replace: RAYCLUSTER-AUTOSCALER-SMALL-GROUP-WORKER-POD-NAME
+
 [rayservice-sample-raycluster-name]
 regex: rayservice-sample-raycluster-[a-z0-9]{5}(?!-)
 replace: RAYSERVICE-SAMPLE-RAYCLUSTER-NAME
@@ -62,9 +70,21 @@ replace: RAYJOB-CLUSTER-SMALL-GROUP-WORKER-POD-NAME
 regex: \d+m\d+s|\d+m|\d+s
 replace: TIME-DURATION
 
-[timestamp]
-regex: \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z
-replace: TIMESTAMP
+[iso-time-stamp]
+regex: \d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}[.,]?\d*
+replace: ISO-TIME-STAMP
+
+[ctime-time-stamp]
+regex: [A-Z][a-z]{2}\s[A-Z][a-z]{2}\s+\d{1,2}\s\d{2}:\d{2}:\d{2}\s\d{4}
+replace: CTIME-TIME-STAMP
+
+[elapsed-time]
+regex: \d+\.\d+\sseconds
+replace: ELAPSED-TIME
+
+[record-stamp]
+regex: \d+-\d+-\d+T\d+:\d+:\d+Z
+replace: TIME-STAMP
 
 [IPV4]
 regex: (?:\d{1,3}\.){3}\d{1,3}(\s*)
@@ -77,3 +97,7 @@ replace: PYTHON-LOGGER-PREFIX
 [ray-cluster-resources-object-store-memory]
 regex: 'object_store_memory'\s*:\s*\d+(?:\.\d+)?\}
 replace: RAY-CLUSTER-RESOURCES-OBJECT-STORE-MEMORY
+
+[raycluster-autoscaler-object-store-memory]
+regex: 0B/\d+\.\d+\s*[GM]iB object_store_memory
+replace: RAYCLUSTER-AUTOSCALER-OBJECT-STORE-MEMORY