chore: update reusability of some parameters, update versions of ingr…

[ikatlinsky]

This pull request addresses 2 cases:

1. Updating some of the configuration options to be rendered through the tpl directive, which is needed to improve configurability and reusability of the parameters when the values file is composed. Ideally all parameters should be migrated to this approach to make it more consistent and predictable.
   For example:

Ingress

  ingress:
    enabled: true
    annotations: 
      kubernetes.io/ingress.class: nginx 
    hosts:
      - host: "{{ tpl .Values.global.app.host . }}"
        paths:
          - "/"
    tls:
      - secretName: "{{ tpl .Values.global.config.secrets.tlsSecret . }}"
        hosts:
          - "{{ tpl .Values.global.app.host . }}"

External etcd

  externalEtcd:
    host:
      - "http://{{ tpl .Values.global.app.etcdHost . }}:2379"
    prefix: "/apisix"
    user: ""

2. Updating the version of the dashboard and ingress controller images to the latest versions

[ikatlinsky]

@Gallardot @AlinsRan please review

[ikatlinsky]

@Gallardot @AlinsRan sorry for pinging, can you please check PR

[Gallardot]

@Revolyssup @shreemaan-abhishek PTAL.

[ikatlinsky]

@Revolyssup @shreemaan-abhishek up

[ikatlinsky]

@Revolyssup @shreemaan-abhishek up

[ikatlinsky]

@Gallardot @AlinsRan @Revolyssup @shreemaan-abhishek up

[ikatlinsky]

@Gallardot @AlinsRan @Revolyssup @shreemaan-abhishek up

[ikatlinsky]

@Gallardot @AlinsRan @Revolyssup @shreemaan-abhishek up

[Gallardot]

LGTM

[ikatlinsky]

@AlinsRan @Revolyssup @shreemaan-abhishek up