Add GKE Resource Consumption Metering, promote resource export to GA

[rileykarson]

Fixes hashicorp/terraform-provider-google#4634, supersedes #2705

Test changes are a little messy, I got rid of a conditional block and made it two cases instead.

Release Note Template for Downstream PRs (will be copied)

container: added `resource_usage_export_config` to `google_container_cluster`, previously only available in `google-beta` (ga only)

container: added `enable_resource_consumption_metering` to `resource_usage_export_config` in `google_container_cluster` (beta only)

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 3 files changed, 201 insertions(+))
Terraform Beta: Diff ( 3 files changed, 58 insertions(+), 16 deletions(-))

[morgante]

I think this file also needs to be updated: https://github.com/GoogleCloudPlatform/magic-modules/blob/master/third_party/validator/container.go

Somewhat off topic, but I thought we had some CI which would detect drift in manually written resources for conversion?

[megan07]

LGTM!

[megan07]

nit: indentation

[rileykarson]

@morgante: Filed hashicorp/terraform-provider-google#5988 to resync container cluster, hashicorp/terraform-provider-google#5989 to get the Magician to warn us again

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 3 files changed, 201 insertions(+))
Terraform Beta: Diff ( 3 files changed, 58 insertions(+), 16 deletions(-))

[morgante]

Thanks @rileykarson!