internal server error on helm install should be system error

[briandealwis]

@PriyaModali saw an Internal server error when deploying a Helm chart in Kokoro, but Skaffold mis-attributes the error as a user error (DEPLOY_HELM_USER_ERR):

    dev_test.go:265: event received timestamp:<seconds:1614793438 nanos:168027477 > event:<deployEvent:<status:"Failed" err:"install: exit status 1" errCode:DEPLOY_HELM_USER_ERR actionableErr:<errCode:DEPLOY_HELM_USER_ERR message:"install: exit status 1" > > > entry:"Deploy failed"
    dev_test.go:265: event received timestamp:<seconds:1614793438 nanos:168871950 > event:<devLoopEvent:<status:"Failed" err:<errCode:DEPLOY_HELM_USER_ERR message:"install: exit status 1" > > > entry:"Update failed with error code DEPLOY_HELM_USER_ERR"
exiting dev mode because first deploy failed: install: exit status 1
time="2021-03-03T17:43:59Z" level=info msg="Ran [skaffold dev --namespace skaffoldq6hn5 --default-repo gcr.io/k8s-skaffold --port-forward --rpc-port 61893] in 23.358 seconds"
    dev_test.go:251: timed out waiting for port forwarding event
    helper.go:184: Skaffold log:
         Listing files to watch...
        >  - gke-loadbalancer
        > Generating tags...
        >  - gke-loadbalancer -> gcr.io/k8s-skaffold/gke-loadbalancer:v1.20.0-64-gd962ed65f
        > Checking cache...
        >  - gke-loadbalancer: Found Remotely
        > Tags used in deployment:
        >  - gke-loadbalancer -> gcr.io/k8s-skaffold/gke-loadbalancer:v1.20.0-64-gd962ed65f@sha256:e496ba5bd8562eeb30e09a14d24844aaee13598af5bf83ac5c4266efd6f23d90
        > Starting deploy...
        > Helm release skaffold-helm-skaffoldq6hn5 not installed. Installing...
        > Error: an error on the server ("Internal Server Error: \"/api/v1/namespaces/skaffoldq6hn5/services\": the server is currently unable to handle the request") has prevented the request from succeeding (post services)

Expected behavior

Actual behavior

Information

• Skaffold version:
• Operating system:
• Installed via:
• Contents of skaffold.yaml:

<paste your skaffold.yaml here>

Steps to reproduce the behavior

1. a clonable repository with the sample skaffold project
2. skaffold <command>
3. ...