Randomize network name in the basic cluster

[rpgoog]

Fixes b/499445670
Fixes hashicorp/terraform-provider-google#26761

Description

This PR fixes a failing acceptance test caused by a hardcoded network name (cluster-net1) colliding across test runs in the shared CI project.

It replaces the hardcoded string in the hypercomputecluster_cluster_basic.tf.tmpl file with a variable, and configures the Cluster.yaml file to inject a randomized suffix during test execution using test_vars_overrides.

Randomize network name in the basic cluster test to prevent collisions

[github-actions]

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

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[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 ( 1 file changed, 2 insertions(+), 1 deletion(-))
google-beta provider: Diff ( 1 file changed, 2 insertions(+), 1 deletion(-))
Open in Cloud Shell: Diff ( 1 file changed, 1 insertion(+), 1 deletion(-))

[modular-magician]

Tests analytics

Total tests: 5
Passed tests: 3
Skipped tests: 1
Affected tests: 1

Click here to see the affected service packages

• hypercomputecluster

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccHypercomputeclusterCluster_hypercomputeclusterClusterBasicExample

Get to know how VCR tests work

[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccHypercomputeclusterCluster_hypercomputeclusterClusterBasicExample [Debug log]

🟢 No issues found for passed tests after REPLAYING rerun.

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🟢 All tests passed!

View the build log or the debug log for each test