minio-operator mismanaging leader election, also sometimes eating CPU

There are known bugs in minio-operator:

• https://github.com/minio/operator/issues/2450 (I observed it in my dev env)
• there is to be a case where the two minio-operator pods fails to be leader (@feleouet observed it a long time ago, and today my dev env was blocked with Tenant resources remaining not ready just because the no instance of the minio-operator was updating it)