feat - Added K8s warnings capture for select operations. Resolves #647

[chriswhite199]

Explanation

Allows capture of K8s API server warnings for create / apply / update / patch and delete operations, which can then be used in expectations.

This is useful feature for testing Admission controllers that return warnings when resources are amended

Related issue

#647

Proposed Changes

• Add a new warnings list for Cluster and update the k8s client to add a WarningHandler
• Update create / apply / update / patch and delete operations to reset this warnings list and inject the list into the bindings as a new variable

Checklist

• I have read the contributing guidelines.
• I have read the PR documentation guide and followed the process including adding proof manifests to this PR.
• This is a new feature and I have added e2e tests that prove my implementation is effective.

[chriswhite199]

e2e Tests are failing due to docker ToS change and rate limiting on image downloads:

Failed to pull image "nginx": failed to pull and unpack image "docker.io/library/nginx:latest": failed to copy: httpReadSeeker: failed open: unexpected status code https://registry-1.docker.io/v2/library/nginx/manifests/sha256:124b44bfc9ccd1f3cedf4b592d4d1e8bddb78b51ec2ed5056c52d3692baebc19: 429 Too Many Requests - Server message: toomanyrequests: You have reached your unauthenticated pull rate limit. https://www.docker.com/increase-rate-limit