F datasource vpclattice service network service associations

[yfauser]

Rollback Plan

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

Changes to Security Controls

No changes

Description

• Added a new datasource: aws_vpclattice_service_network_service_associations, backed by the ListServiceNetworkServiceAssociations API.
• The new datasource accepts both a service_network_identifier or a service_identifier as argument (ExactlyOneOf), and returns a List of ServiceNetworkServiceAssociationsSummary Objects.
• Tests include both arguments and tests assignment to two different Service Networks

Relations

Relates #41398

References

ListServiceNetworkServiceAssociations API
ServiceNetworkServiceAssociationsSummary

Once this PR was reviewed and accepted, I will work on the other four datasources that are requested in Issue #41398.

Output from Acceptance Testing

make testacc TESTS=TestAccVPCLatticeServiceNetworkServiceAssociationsDataSource PKG=vpclattice
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.9 test ./internal/service/vpclattice/... -v -count 1 -parallel 20 -run='TestAccVPCLatticeServiceNetworkServiceAssociationsDataSource'  -timeout 360m -vet=off
2025/05/20 11:29:20 Initializing Terraform AWS Provider...
=== RUN   TestAccVPCLatticeServiceNetworkServiceAssociationsDataSource_basic
=== PAUSE TestAccVPCLatticeServiceNetworkServiceAssociationsDataSource_basic
=== CONT  TestAccVPCLatticeServiceNetworkServiceAssociationsDataSource_basic
--- PASS: TestAccVPCLatticeServiceNetworkServiceAssociationsDataSource_basic (54.97s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/vpclattice 61.328s
...

[github-actions]

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[github-actions]

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