feat: Add `data_tiering_enabled`

[Cheezmeister]

what

• Introduce var.data_tiering_enabled and plumb it through to the aws provider

why

• @teikametrics needs to set data_tiering_enabled true to provision our desired node type

  Error: error creating ElastiCache Replication Group (bidder-redis-cluster-production): InvalidParameterCombination: When     using the cache.r6gd.xlarge node type, you must enable data tiering.
  status code: 400, request id: REDACTED

• This flag data_tiering_enabled doesn't currently exist in the terraform-aws-elasticache-redis module

references

• https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/elasticache_replication_group#data_tiering_enabled

[Cheezmeister]

The build fails with message

+ echo 'Changes detected. Pushing to the PR branch'

Please, what are the changes, and what access is required to complete CI?

EDIT: I followed some breadcrumbs and found make pr/auto-format sufficient to make the doc changes that the CI job wants to see. So we're all clear there.

[nitrocode]

/test all

[Cheezmeister]

/test all

[nitrocode]

/test all

[nitrocode]

/test all