Simplify giithub-actions workflows

[Smirl]

Summary

We currently have a bunch of separate workflows that run on each commit of a pull request. These include running unit tests, testing helm charts, deploying the controller via kusomize to a kind cluster to e2e testing, deploying the controller via helm to test helm, etc.

There is just a single job per workflow, with repeated steps across workflows (such as building the go binary, docker image, etc.).

It would be nice if we could create a single workflow for PR testing which using the pipeline nature of github actions to share artifacts, etc. between jobs (for example the go modules and docker image). Spinning up a kind cluster might not be able to be shared between jobs, but perhaps steps could be combined for both helm and e2e tests?