Validate and automatically clean/truncate container names

[polyaxon-team]

Describe the bug

Polyaxon generates init container names automatically based on the connection's name to make it clear what the container's purpose is. If the connection name is long the container name is then invalid and makes jobs/services un-deployable.

To reproduce

Use a long connection name, for example the artifacts store, and deploy a tensorboard, the system will show an warning like the following:

Deployment.apps "plx-operation-UUID" is invalid:              
spec.template.spec.initContainers[2].name: Invalid value:                                 
"polyaxon-init-artifacts-VERY_LONG_NAME-39c73cfbbd": must be no
more than 63 characters                                                                   

Expected behavior

The system should automatically clean the container names and auto-truncate to respect k8s limit.