chore(module): use v1alpha3 to install vmclass/generic

[diafour]

Description

• Change vmclass generic manifest to use strings for coreFractions.
• Fix error when hook trying to patch vmclass/generic without annotations.

Why do we need it, and what problem does it solve?

1. Upgrade vmclass version after merging feat(vmclass): use percentage format for coreFractions values #1601.
2. Fix blocking the main queue when new vmclass generic is created, but module-state secret is not created. E.g. this error may occur during the first installation of the module when ModuleConfig is invalid.

What is the expected result?

Newly created vmclass/generic has "apiVersion: virtualization.deckhouse.io/v1alpha3".

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: module
type: chore
summary: Upgrade version to v1alpha3 for vmclass/generic, fix blocking main queue in case of unsuccessful module installation.