[TechDebt]: Fix flaky ELBV2 test config

[jar-b]

Description

The TestAccELBV2ListenerRuleDataSource_actionForwardWeightedStickiness acceptance test uses a test configuration which intermittently causes unit tests to panic.

panic: runtime error: slice bounds out of range [:30] with length 29 [recovered]
    panic: runtime error: slice bounds out of range [:30] with length 29

goroutine 99 [running]:
testing.tRunner.func1.2({0x18f7af40, 0xc000da0e10})
    /opt/hostedtoolcache/go/1.23.2/x64/src/testing/testing.go:1632 +0x230
testing.tRunner.func1()
    /opt/hostedtoolcache/go/1.23.2/x64/src/testing/testing.go:1635 +0x35e
panic({0x18f7af40?, 0xc000da0e10?})
    /opt/hostedtoolcache/go/1.23.2/x64/src/runtime/panic.go:785 +0x132
github.com/hashicorp/terraform-provider-aws/internal/service/elbv2_test.testAccListenerRuleDataSourceConfig_actionForwardWeightedStickiness({0xc000d42100, 0x1d})
    /home/runner/work/terraform-provider-aws/terraform-provider-aws/internal/service/elbv2/listener_rule_data_source_test.go:1109 +0x23a
github.com/hashicorp/terraform-provider-aws/internal/service/elbv2_test.TestAccELBV2ListenerRuleDataSource_actionForwardWeightedStickiness(0xc002045d40)
    /home/runner/work/terraform-provider-aws/terraform-provider-aws/internal/service/elbv2/listener_rule_data_source_test.go:445 +0x1e6
testing.tRunner(0xc002045d40, 0x19ac9410)
    /opt/hostedtoolcache/go/1.23.2/x64/src/testing/testing.go:1690 +0xf4
created by testing.(*T).Run in goroutine 1
    /opt/hostedtoolcache/go/1.23.2/x64/src/testing/testing.go:1743 +0x390
FAIL    github.com/hashicorp/terraform-provider-aws/internal/service/elbv2  2.344s

The root of the issue is this attempt to truncate the generated resource name to 30 characters in order to meet the AWS requirement for ELB target group names to be 32 characters or less.

https://github.com/hashicorp/terraform-provider-aws/blob/a6711969ea28cfce6821a37e95699a7c892f3c14/internal/service/elbv2/listener_rule_data_source_test.go#L1108-L1110

At times the generated resource name may be less than 30 bytes in length, causing a crash.

References

https://github.com/hashicorp/terraform-provider-aws/actions/runs/11782921152/job/32819162741

Would you like to implement a fix?

None

[github-actions[bot]]

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