tgc-revival: support compute tgc autoscaler

[zli82016]

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 8 files changed, 1520 insertions(+), 15 deletions(-))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 8 files changed, 1520 insertions(+), 15 deletions(-))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 8 files changed, 1520 insertions(+), 15 deletions(-))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 7 files changed, 1510 insertions(+), 5 deletions(-))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 7 files changed, 1510 insertions(+), 5 deletions(-))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 7 files changed, 1510 insertions(+), 5 deletions(-))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 7 files changed, 1510 insertions(+), 5 deletions(-))

[trodge]

I think we should be able to have shared function templates for TGC the way we do for TPG.

[trodge]

Since the custom_expand is a template used by many resources, can we use a similar approach in TGC to not need a separate template for each resource?

[trodge]

As discussed offline, we'll merge this for now and refactor later to a more generic method of handling zone, region and location fields when we have more resources covered.