Set New TSDB Schema as default index "from now on"

This configuration has been running in our release cluster since December. Grafana stated with loki 2.8.0 that TSDB is out of BETA/TESTING and is now their default on grafana cloud instances. We saw no issues in our release cluster so we can set something similar to this for the package for customers to consume:

loki:
  schemaConfig:
    configs:
      - from: 2020-01-11
        index:
          period: 24h
          prefix: loki_index_
        object_store: s3
        schema: v11
        store: boltdb-shipper
      - from: 2022-04-20
        store: tsdb
        object_store: s3
        schema: v12
        index:
          prefix: loki_tsdb_
          period: 24h
  storage_config:
    boltdb_shipper:
      active_index_directory: /var/loki/boltdb-shipper-active
      cache_location: /var/loki/boltdb-shipper-cache
      cache_ttl: 24h
      shared_store: s3
    tsdb_shipper:
      active_index_directory: /var/loki/tsdb-index
      cache_location: /var/loki/tsdb-cache
      shared_store: s3