cmd/operator-sdk/run: remove legacy run subcommand

[joelanford]

Description of the change:
Remove the legacy run subcommand. This also incidentally removes support for run local for legacy Ansible and Helm projects

Motivation for the change:
To remove legacy code in preparation for 1.0 release.

Checklist

If the pull request includes user-facing changes, extra documentation is required:

• Add a new changelog fragment in changelog/fragments (see changelog/fragments/00-template.yaml)
• Add or update relevant sections of the docs website in website/content/en/docs

[hasbro17]

We have some links in the CHANGELOG referencing ./website/content/en/docs/cli/operator-sdk_run.md.
https://github.com/operator-framework/operator-sdk/blob/master/CHANGELOG.md#v0150

We could update those to be non-relative links https://v0-18-x.sdk.operatorframework.io/docs/cli/operator-sdk_run/

Or just use the git sha if we don't want to point to the website in such an older release.

[estroz]

You can also remove this check and these lines. Also it looks like a reference to the removed CLI doc for run still exists somewhere.

[hasbro17]

Ah this gets rid of run packagemanifests as well. Great, I don't have to push my PR now :)

[estroz]

/lgtm

[joelanford]

@hasbro17 🤣 Sorry, I got overzealous.

I updated the links to point to the docs as they existed at the time when they were referenced (so to our old github docs at the v0.15.0 tag)

[joelanford]

I also went ahead and removed legacy cleanup command support with the same changes that @estroz suggested.

[hasbro17]

@estroz We can remove the following internal pkgs/code for legacy generate packagemanifests right?
https://github.com/operator-framework/operator-sdk/blob/master/internal/generate/olm-catalog/package_manifest.go
https://github.com/operator-framework/operator-sdk/blob/master/internal/generate/olm-catalog/package_manifest_test.go

But I can do a follow up for that.

[hasbro17]

LGTM

[hasbro17]

Per offline discussion, this needs a CHANGELOG fragment so we can track and summarize all CLI changes in the 1.0.0 release notes.

[joelanford]

If CI passes on this commit, let's just merge and I'll do a fragment follow-up. I need to do one for #3385 as well.

[openshift-ci-robot]

New changes are detected. LGTM label has been removed.

[tengqm]

amd -> and