Add a test job for KMC to verify the KMC helm charts and image on PRs

[mfaizanse]

Description

• Currently, on PRs for KMC, no job tries to deploy KMC and check if everything is fine.
  If you bump a non-existing KMC (or invalid) image in helm chart, then still the PR will be all green.
• there are no integration tests for integration with KEB and EDP

Task(s):

• Option 1: Only verify that KMC image exists.

  • Add Github action.
  • Render KCP helm chart with KMC enabled.
  • Extract the KMC image from the rendered manifests.
  • Docker pull to verify if the KMC image is valid.

• Option 2: Deploy KCP with KMC on k3d and test end-to-end.

  • Add Github action.
  • Create a k3d cluster.
  • Create kcp-system namespace.
  • Create k8s secret (name: kubeconfig-<runtimeId>) with kubeconfig for k3d in kcp-system namespace.
  • mock KEB and EDP, and deploy the mock as a pod in kcp-system namespace..
    • KEB:
      • GET /runtimes --> Returns list of runtimes.
    • EDP:
      • POST /namespaces/kyma-dev/datastreams/kmc-consumption-metrics/1/dataTenants/<tenantId>/dev/events --> Receives event and saves it in-memory.
      • GET /edp/events --> returns all received events/data.
  • Deploy KMC on k3d in kcp-system namespace..
  • Verify if the required data is pushed to mocked EDP.

Acceptance Criteria(s):

• KMC is tested on PRs.

[mfaizanse]

This ticket is blocked until the KMC is moved to its separate repository. Then we can check if option 1 is already covered by the deployment pipelines.