Proxy collector and analyzer

[xavpaice]

Describe the rationale for the suggested feature.

A number of support cases have been noted whereby the proxy settings on the host are incorrect. It would be good to be able t capture those on install, in a host preflight, and an application preflight. The same collector/analyzer would be useful in support bundles to assist troubleshooting.

Describe the feature

1. Take the proxy env settings, and use them to attempt to reach a URL we know is necessary for installation.
2. Check that NO_PROXY includes the IP address of the k8s api and/or the node itself
3. Create an in-cluster equivalent that runs the same checks from within a container

Describe alternatives you've considered

Additional context