feat(v2): upgrades without manager

[emosbaugh]

What this PR does / why we need it:

Migration runs the following operations:

• checks if a migration is needed, if not exits
• sets the installation status condition V2MigrationInProgress to true
• scales down operator deployment replicas to 0
• force deletes Chart CRs
• removes the spec.extensions.helm from the k0s ClusterConfig CR
• sets the installation status condition V2MigrationInProgress to false, completed

After the migration it is expected that the helm charts will be upgraded by the v2 upgrade and the operator deployment replicas set back to 1

Which issue(s) this PR fixes:

Does this PR require a test?

Does this PR require a release note?

Does this PR require documentation?

[github-actions]

This PR has been released (on staging) and is available for download with a embedded-cluster-smoke-test-staging-app license ID.

Online Installer:

curl "https://staging.replicated.app/embedded/embedded-cluster-smoke-test-staging-app/ci/appver-dev-46934e7" -H "Authorization: $EC_SMOKE_TEST_LICENSE_ID" -o embedded-cluster-smoke-test-staging-app-ci.tgz

Airgap Installer (may take a few minutes before the airgap bundle is built):

curl "https://staging.replicated.app/embedded/embedded-cluster-smoke-test-staging-app/ci-airgap/appver-dev-46934e7?airgap=true" -H "Authorization: $EC_SMOKE_TEST_LICENSE_ID" -o embedded-cluster-smoke-test-staging-app-ci.tgz

Happy debugging!