Supporting Helm v3 Changes

Changes:
- Changed Chart apiVersion to v2 from v1
- Changed .Capabilities.KubeVersion.GitVersion to .Capabilities.KubeVersion.Version
- Changes in helm install, delete, list v2 commands to v3
- Disabled OpenAPI validation in helm install for scenario and sandbox pods
- Changed helm version from 2.16.1 to 3.3.1, updated download link and snap helm command
- Removed helm init from virt-engine and ansible
- Changes in helm version parsing code

Testing:
- Manually tested creating and deleting sandbox, deploying and terminating demo1 and demo2 scenario
- All UT's and Cypress tests passed