🌱 Use fleet to deploy CNI across all providers

[Danil-Grigorev]

What this PR does / why we need it:

Changing how overall CNI is deployed across providers. Additionally moving kindnet.yaml into examples and removing old calico.yaml as well as places where it was redundantly used.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1256

Special notes for your reviewer:

Checklist:

• squashed commits into logical changes
• includes documentation
• adds unit tests
• adds or updates e2e tests

[mjura]

It looks that CI is failing:

   Unexpected error:
      <template.ExecError>: 
      template: fleet-repo-template:12:9: executing "fleet-repo-template" at <.Revision>: can't evaluate field Revision in type framework.FleetCreateGitRepoInput
      {
          Name: "fleet-repo-template",
          Err: <*errors.errorString | 0xc000494ef0>{
              s: "template: fleet-repo-template:12:9: executing \"fleet-repo-template\" at <.Revision>: can't evaluate field Revision in type framework.FleetCreateGitRepoInput",
          },
      }

[salasberryfin]

I still think this may break nightly E2E tests. We should validate the workflow on this version, perhaps creating a new branch and running it from there.