accessTokenInactivityTimeout field is required when configuring oauth identity providers

It failed to configure oauth identity providers in the HostedCluster when accessTokenInactivityTimeout is not set

always

1. Create a cluster
2. configure htpasswd without accessTokenInactivityTimeout field in the HostedCluster CR
3. it failed to apply

jiezhao-mac:hypershift jiezhao$ oc get hostedcluster -n clusters -o yaml > cluster.yaml 
  spec:
    configuration:
      oauth:
        identityProviders:
        - htpasswd:
            fileData:
              name: htpass-secret
          mappingMethod: claim
          name: my_htpasswd_provider
          type: HTPasswd
      secretRefs:
      - name: htpass-secret
jiezhao-mac:hypershift jiezhao$ oc apply -f cluster.yaml
The HostedCluster "jie-test" is invalid: spec.configuration.oauth: Invalid value: "object": no such key: tokenConfig evaluating rule: spec.configuration.oauth.tokenConfig.accessTokenInactivityTimeout minimum acceptable token timeout value is 300 seconds

htpasswd should be configured successfully without accessTokenInactivityTimeout field

When accessTokenInactivityTimeout it set to 300s, htpasswd is configured in the HostedCluster successfully.

jiezhao-mac:hypershift jiezhao$ oc get hostedcluster -n clusters -o yaml > cluster.yaml

  spec:
    configuration:
      oauth:
        identityProviders:
        - htpasswd:
            fileData:
              name: htpass-secret
          mappingMethod: claim
          name: my_htpasswd_provider
          type: HTPasswd
        tokenConfig:
          accessTokenInactivityTimeout: 300s
      secretRefs:
      - name: htpass-secret

jiezhao-mac:hypershift jiezhao$ oc apply -f cluster.yaml 
hostedcluster.hypershift.openshift.io/jie-test configured
jiezhao-mac:hypershift jiezhao$ 

jiezhao-mac:hypershift jiezhao$ oc get hostedcluster/jie-test -n clusters -ojsonpath='{.spec.configuration}' | jq
{
  "oauth": {
    "identityProviders": [
      {
        "htpasswd": {
          "fileData": {
            "name": "htpass-secret"
          }
        },
        "mappingMethod": "claim",
        "name": "my_htpasswd_provider",
        "type": "HTPasswd"
      }
    ],
    "tokenConfig": {
      "accessTokenInactivityTimeout": "300s"
    }
  }
}