Update ManagedZone.yaml to contain ransom suffix for dns_name

[shellyvilenko]

The Terraform configuration in these tests used a hardcoded dns_name domain name ("m-z.gcp.tfacc.hashicorptest.com."). When these tests run in parallel (or concurrently within the same testing project), multiple test executions attempt to create a Cloud DNS managed zone with the exact same domain name.

This PR fixes the flakiness and parallel collision failures in the google_dns_managed_zone IAM and quickstart example tests.

Problem

When tests run in parallel, multiple test executions attempt to create a Cloud DNS managed zone with the exact same hardcoded domain name ("m-z.gcp.tfacc.hashicorptest.com."). Since DNS zone domain names must be globally unique within the project/nameservers, this results in collisions and managedZoneDnsNameNotAvailable API errors.

Solution

Updated the dns_managed_zone_quickstart sample's test_vars_overrides in mmv1/products/dns/ManagedZone.yaml to dynamically append randomSuffix to the dns_name (i.e., "m-z-" + randomSuffix + ".gcp.tfacc.hashicorptest.com."). This guarantees a unique domain name for every concurrent test invocation.

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dns: fixed parallel test flakiness in DNS Managed Zone IAM tests

[github-actions]

Googlers: For automatic test runs see go/terraform-auto-test-runs.

@SirGitsalot, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit cf089e6:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	2 files changed, 9 insertions(+), 9 deletions(-)
google-beta provider	View Diff	2 files changed, 9 insertions(+), 9 deletions(-)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
61	51	3	7

Affected Service Packages

• dns

Learn how VCR tests work

---

Step 1: Replaying Mode

Action taken

Found 7 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit.

Click here to see the affected tests

• TestAccDNSManagedZoneIamBindingGenerated
• TestAccDNSManagedZoneIamBindingGenerated_withCondition
• TestAccDNSManagedZoneIamMemberGenerated
• TestAccDNSManagedZoneIamMemberGenerated_withCondition
• TestAccDNSManagedZoneIamPolicyGenerated
• TestAccDNSManagedZoneIamPolicyGenerated_withCondition
• TestAccDNSManagedZone_dnsManagedZoneQuickstartExample

View the replaying VCR build log

---

Step 2: Recording Mode

Recording Mode	Replaying Rerun	Test Name
✅ Log	✅	TestAccDNSManagedZoneIamBindingGenerated
✅ Log	✅	TestAccDNSManagedZoneIamBindingGenerated_withCondition
✅ Log	✅	TestAccDNSManagedZoneIamMemberGenerated
✅ Log	✅	TestAccDNSManagedZoneIamMemberGenerated_withCondition
✅ Log	✅	TestAccDNSManagedZoneIamPolicyGenerated
✅ Log	✅	TestAccDNSManagedZoneIamPolicyGenerated_withCondition
✅ Log	✅	TestAccDNSManagedZone_dnsManagedZoneQuickstartExample

🟢 All tests passed!

View the recording VCR build log or the debug logs folder for detailed results.

@shellyvilenko, @SirGitsalot VCR tests complete for cf089e6!

[github-actions]

@SirGitsalot This PR has been waiting for review for 3 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.