Support HTTP tunneling on all Upstreams

[ryanrolds]

Description

Refactors the HTTP tunneling plugin to support all Upstreams. I plan to confirm this work with additional kubernetes/e2e tests before merging.

Misc changes:

• Plumbed the reporter through GeneratedResources so that the plugin could report issues with specific Upstreams

Last week I added kubernetes/e2e tests that confirm the works in Edge and GW APIs. This work refactors it to work in more cases. My plan is to add additional kubernetes/e2e tests to solo-projects to confirm that the tunneling works for the specific customer case (remote JWKS).

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

[solo-changelog-bot]

Issues linked to changelog:
https://github.com/solo-io/solo-projects/issues/7497

[github-actions]

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