🐛 Disabling dashboard ingressroute should delete it

[mloiseleur]

What does this PR do?

Set dashboard IngressRoute as a regular helm resource instead of a hook.
Forced to make a new PR from #668 : I was unable to update it.

Motivation

It's not needed anymore to install it with a hook.
Fixes #115

If you see during upgrade this message

Error: UPGRADE FAILED: rendered manifests contain a resource that already exists. 
Unable to continue with update: IngressRoute "traefik-dashboard" in namespace "default" exists and cannot be imported into the current release: invalid ownership metadata;
annotation validation error: missing key "meta.helm.sh/release-name": must be set to "traefik"; 
annotation validation error: missing key "meta.helm.sh/release-namespace": must be set to "default"

That means you were on Traefik Helm Chart in version < 15.2.1 and tried to upgrade directly to latest version.
You'll need to upgrade to at least v15.2.1 before upgrading to latest version.

More

• Yes, I updated the tests accordingly
• Yes, I ran make test and all the tests passed
• Is there a way to avoid break during upgrade between hook version and regular version ?