Revert "Support IPV6_ONLY configurations for compute API"

[slevenick]

Reverts #12283
Fixes: hashicorp/terraform-provider-google#17838

Test newly started failing after the introduction. I read the error message and though it was unrelated, paired with the presence of the failing test issue I thought this was already failing for unrelated reasons.

We should lean towards reverting until we can understand what is going on here

compute: `stack_type` can now be set to `IPV6_ONLY` on `google_compute_subnetwork`, `google_compute_instance`, `google_compute_instance_template` and `google_compute_region_instance_template`. REVERTED: PLEASE REMOVE

[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.

google provider: Diff ( 8 files changed, 9 insertions(+), 12 deletions(-))
google-beta provider: Diff ( 8 files changed, 9 insertions(+), 12 deletions(-))

Breaking Change(s) Detected

The following breaking change(s) were detected within your pull request.

• Field network_interface.ipv6_access_config transitioned from optional+computed to optional google_compute_instance_template - reference
• Field network_interface.ipv6_access_config transitioned from optional+computed to optional google_compute_instance - reference
• Field network_interface.ipv6_access_config transitioned from optional+computed to optional google_compute_region_instance_template - reference

If you believe this detection to be incorrect please raise the concern with your reviewer.
If you intend to make this change you will need to wait for a major release window.
An override-breaking-change label can be added to allow merging.

[modular-magician]

Tests analytics

Total tests: 1064
Passed tests: 991
Skipped tests: 73
Affected tests: 0

Click here to see the affected service packages

• compute

🟢 All tests passed!

View the build log

[zli82016]

LGTM