feat: add delegation_record to route53 resolver rule

[stefanfreitag]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

No changes to security controls.

Description

With DELEGATE a new rule type for Route53 resolver rules has been introduced. The section References contains links to What`s new article and CloudFormation docs.

• To be able to use DELEGATE as rule type, we need to make the domain_name argument optional: DELEGATE requires a delegation_record containing the DNS name.
• UpdateResolverRule does not allow to update the delegation_record, hence we ForceNew on changes to delegation_record.
• ListResolverRules does not support to filter for delegation_record, hence the filter expression in the data source is not updated.

Relations

Closes #43239

References

• "What's new" article
• Delegate in AWS SDK Go v2
• AWS::Route53Resolver::ResolverRule Cloudformation

Output from Acceptance Testing

❯ make testacc TESTS=TestAccRoute53ResolverRule_delegationRecord  PKG=route53resolver
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.5 test ./internal/service/route53resolver/... -v -count 1 -parallel 20 -run='TestAccRoute53ResolverRule_delegationRecord'  -timeout 360m -vet=off
2025/07/13 21:36:36 Creating Terraform AWS Provider (SDKv2-style)...
2025/07/13 21:36:36 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccRoute53ResolverRule_delegationRecord
=== PAUSE TestAccRoute53ResolverRule_delegationRecord
=== CONT  TestAccRoute53ResolverRule_delegationRecord
--- PASS: TestAccRoute53ResolverRule_delegationRecord (280.07s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/route53resolver    280.290s

Data source

❯ make testacc TESTS=TestAccRoute53ResolverRuleDataSource_delegationRecord  PKG=route53resolver
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.5 test ./internal/service/route53resolver/... -v -count 1 -parallel 20 -run='TestAccRoute53ResolverRuleDataSource_delegationRecord'  -timeout 360m -vet=off
2025/07/13 21:43:47 Creating Terraform AWS Provider (SDKv2-style)...
2025/07/13 21:43:47 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccRoute53ResolverRuleDataSource_delegationRecord
=== PAUSE TestAccRoute53ResolverRuleDataSource_delegationRecord
=== CONT  TestAccRoute53ResolverRuleDataSource_delegationRecord
--- PASS: TestAccRoute53ResolverRuleDataSource_delegationRecord (248.39s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/route53resolver    248.593s

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