Recreate ubuntu 20.04 environment and get a list of invalid indexes

Recreate ubuntu 20.4 environment and run amcheck script to confirm that we still get the identical list of invalid indexes

Reference: https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/14947#note_821689347

Acceptance criteria:

Create the following scenario:

1 - Provision a cluster in the benchmark environment using Ubuntu 20.04 and the disk snapshot from production.

2 - List the invalid indexes and add to this issue.