Add aws_vpc_endpoint_associations datasource

[drewtul]

Description

Add aws_vpc_endpoint_associations datasource to allow listing of the resources associated with a VPC Endpoint.

Relations

Closes #41859
Closes #41765

References

Output from Acceptance Testing

% make testacc ACCTEST_PARALLELISM=3 TESTS=TestAccVPCEndpointAssociationsDataSource PKG=ec2
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.7 test ./internal/service/ec2/... -v -count 1 -parallel 3 -run='TestAccVPCEndpointAssociationsDataSource'  -timeout 360m -vet=off
2025/03/19 15:50:20 Initializing Terraform AWS Provider...
=== RUN   TestAccVPCEndpointAssociationsDataSource_basic
=== PAUSE TestAccVPCEndpointAssociationsDataSource_basic
=== RUN   TestAccVPCEndpointAssociationsDataSource_serviceNetwork
=== PAUSE TestAccVPCEndpointAssociationsDataSource_serviceNetwork
=== CONT  TestAccVPCEndpointAssociationsDataSource_basic
=== CONT  TestAccVPCEndpointAssociationsDataSource_serviceNetwork
--- PASS: TestAccVPCEndpointAssociationsDataSource_basic (113.52s)
--- PASS: TestAccVPCEndpointAssociationsDataSource_serviceNetwork (120.11s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ec2        126.698s

[github-actions]

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