Use go install for Iter8

[Alan-Cha]

Excerpt from #1448:

Use go install for Iter8. go install is a powerful command that supports multiple architectures, minor version prefixes, SHA/commit-id based install, as well as installations from PR branches, and latest already. This means, we don't need binaries, homebrew, and GitHub action for Iter8 install.

[sriumcp]

• We will no longer create assets:

  iter8/.github/workflows/assets.yaml

  Line 8 in 8d70e30

  assets:

• Wherever we use Iter8 GitHub action (e.g.,

  iter8/.github/workflows/assets.yaml

  Line 104 in 8d70e30

  - uses: iter8-tools/[email protected]

  ), we change it so that we go install iter8. Specifically, instead of - uses: iter8-tools/[email protected], we simply do -run: "go install github.com/iter8-tools/[email protected]" -- this needs to happen in a few places in our CI, because we are using Iter8 GitHub Action in a few places in the CI.
• Remove action.yaml that supports the Iter8 Github Action
• Make changes to Iter8 CLI install section/descriptions everywhere in iter8.tools
• We still want to tell users (in iter8.tools website) how to use Iter8 within their GitHub action workflow: so modify iter8.tools documentation to use go install github.com/iter8-tools/[email protected]