This is the sub-task for the group impersonation work. https://issues.redhat.com/browse/CONSOLE-4734 

Currently[ initPayload struct|https://github.com/Leo6Leo/console/blob/main/pkg/graphql/resolver/utils.go#L39] only supports single ImpersonateGroup string

Acceptance Criteria:

• Update initPayload struct to support multiple groups (array of strings)

• Modify InitPayload function to handle multiple Impersonate-Group headers

• Ensure GraphQL subscriptions work with multi-group context