Add glooctl snapshot cmd

[bleggett]

Description

Adds a glooctl proxy snapshot cmd, which will dump everything the gateway has (stats, config, listeners, endpoints) into a timestamped zipfile, to aid diagnosis of gateway (or non-gateway) problems.

Some of these already exist piecemeal in the tool (config dump, stats dump) but this adds a few extra bobs and creates an artifact.

API changes

Code changes

• Added glooctl proxy snapshot
• Changed GetEnvoyAdminData to take any k8s specifier - previously it always assumed (but did not say) you should give it the name of a deployment. Now, it will work with either a kube-style deployment/<name> specifier, or a raw podname. This was added for glooctl proxy snapshot but also affects glooctl proxy dump and glooctl proxy stats.

Docs changes

TBD

Context

Interesting decisions

The existing code for dump and stats actually would always start hitting the port-forwarded endpoint before the port-forwarding was completed - which would always fail and spam spurious messages. This really needs to be fixed properly by the use of a real Golang kube client, but in the interim we can fix it with stdout scans.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

BOT NOTES:
resolves https://github.com/solo-io/solo-projects/issues/7131

[github-actions]

Visit the preview URL for this PR (updated for commit b24e26c):

https://gloo-edge--pr10239-bleggett-add-glooctl-1khsg578.web.app

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[sam-heilbron]

Looking great! I think this tool will help the usage of capturing actionable information about the running cluster.
I shared some context about potential areas of the code that may solve parts of this already, or areas where we could expand our functionality for better re-use.
I know this is just a draft, but I was hoping to share this to help save you some time in case you were unaware of those code areas. Happy to chat further if it helps!

[solo-changelog-bot]

Issues linked to changelog:
https://github.com/solo-io/solo-projects/issues/7131

[bleggett]

Deployer Single gwc and gw create and validate objs [It] correct deployment with sds, AI extension, and floatinguUserId enabled

This unit test failure looks spurious, it's not related to any change here.

[bleggett]

/kick-ci

[bleggett]

/test

[bleggett]

/kick-ci