Revert "frontend: temporarily add a port 8090 for healthz in mTLS"
Revert "frontend: temporarily add a port 8090 for healthz in mTLS"

This reverts commit 9c8b4bcad2c9cc4405a2a15b430e9823ebfd0a3e.

GoogleCloudPlatform/cloud-ops-sandbox,GoogleCloudPlatform/cloud-ops-sandbox,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/cloud-ops-sandbox,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/cloud-ops-sandbox,GoogleCloudPlatform/cloud-ops-sandbox,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/cloud-ops-sandbox,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/cloud-ops-sandbox