Migrate kyma provision gardener to using kubectl against gardener seed cluster

[kwiatekus]

Description

Update docs and shell scripts which use kyma provision gardener command.
Migrate from deprecated cli command into applying shoot manifests directly (docs)

• occurences

Do not enforce shoot parameters if they are not required. Let gardener defaulting mechanism default values that are not provided (i.e k8s version)

Reasons
kyma cli commands to provision k8s clusters are deprecated and will be removed from kyma cli. Those not be used.
Decision
kyma-project/cli#2051

[halamix2]

Minimal example configs:

GCP

apiVersion: core.gardener.cloud/v1beta1
kind: Shoot
metadata:
  name: test
spec:
  secretBindingName: secretName
  cloudProfileName: gcp
  region: europe-west1
  purpose: evaluation
  provider:
    type: gcp
    infrastructureConfig:
      apiVersion: gcp.provider.extensions.gardener.cloud/v1alpha1
      kind: InfrastructureConfig
      networks:
        workers: 10.250.0.0/16
    controlPlaneConfig:
      apiVersion: gcp.provider.extensions.gardener.cloud/v1alpha1
      kind: ControlPlaneConfig
      zone:  europe-west1-b
    workers:
    - name: cpu-worker
      minimum: 1
      maximum: 2
      machine:
        type: n1-standard-4
      volume:
        type: pd-standard
        size: 20Gi
      zones:
        - europe-west1-b
  networking:
    type: calico
    pods: 100.96.0.0/11
    nodes: 10.250.0.0/16
    services: 100.64.0.0/13

AWS

apiVersion: core.gardener.cloud/v1beta1
kind: Shoot
metadata:
  name: test
spec:
  secretBindingName: secretName
  cloudProfileName: aws
  region: eu-west-1
  purpose: evaluation
  provider:
    type: aws
    infrastructureConfig:
      apiVersion: aws.provider.extensions.gardener.cloud/v1alpha1
      kind: InfrastructureConfig
      networks:
        vpc:
          cidr: 10.250.0.0/16
        zones:
          - name: eu-west-1b
            internal: 10.250.112.0/22
            public: 10.250.96.0/22
            workers: 10.250.0.0/19
    workers:
    - name: cpu-worker
      minimum: 1
      maximum: 2
      machine:
        type: m5.large
      volume:
        type: gp2
        size: 20Gi
      zones:
        - eu-west-1b
  networking:
    type: calico
    pods: 100.96.0.0/11
    nodes: 10.250.0.0/16
    services: 100.64.0.0/13

Azure

apiVersion: core.gardener.cloud/v1beta1
kind: Shoot
metadata:
  name: test
spec:
  secretBindingName: secretName
  cloudProfileName: az
  region: westeurope
  purpose: evaluation
  provider:
    type: azure
    infrastructureConfig:
      apiVersion: azure.provider.extensions.gardener.cloud/v1alpha1
      kind: InfrastructureConfig
      networks:
        vnet:
          cidr: 10.250.0.0/16
        workers: 10.250.0.0/19
    workers:
    - name: cpu-worker
      minimum: 1
      maximum: 2
      machine:
        type: Standard_A4_v2
      volume:
        type: Standard_LRS
        size: 20Gi
  networking:
    type: calico
    pods: 100.96.0.0/11
    nodes: 10.250.0.0/16
    services: 100.64.0.0/13