[CAPG] Add support for ResourceManagerTags

[salasberryfin]

cluster-api-provider-gcp

Issue kubernetes-sigs/cluster-api-provider-gcp#992

Description

GCP Tags are key-value pairs that are bind to the GCP resources. Unlike currently supported labels, tags are not part of the resource metadata but resource in itself. Tag Keys, Values, Bindings are all discreet resources. Tags are used for defining IAM policy conditions, Organization conditionals policies and integrating with Cloud billing for cost management, which are not supported by labels.

• Able to define the list of tags to add to the Compute Instances during cluster creation.
• New Compute resources created for the cluster must have the tags defined.

[salasberryfin]

PR submitted and pending review kubernetes-sigs/cluster-api-provider-gcp#1008

[salasberryfin]

The opened PR was updated and is ready to be reviewed.

[richardcase]

Upstream PR has been approved