Change the service account name of the Pod created by the Mysql Backup Job to any.

[kahirokunn]

We would like to be able to select a configuration that uses OpenID Connect federation for storage authentication.
https://kubernetes.io/ja/docs/reference/access-authn-authz/authentication/

For example, AWS IRSA also uses the OpenID Connect federation.
https://docs.aws.amazon.com/eks/latest/userguide/iam-roles-for-service-accounts.html