feat: Add arn attribute to aws_ec2_transit_gateway_dx_gateway_attachment data source

[acwwat]

Description

The PR is to add the (calculated) arn attribute to the aws_ec2_transit_gateway_dx_gateway_attachment data source.

Relations

Relates #40923 (partly resolves it)

References

Referred to ARN format in Actions, resources, and condition keys for Amazon EC2 as referenced in the original GitHub issue.

Output from Acceptance Testing

$ make testacc TESTS=TestAccTransitGatewayDataSource_serial/DxGatewayAttachment PKG=ec2
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.3 test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccTransitGatewayDataSource_serial/DxGatewayAttachment'  -timeout 360m -vet=off
2025/01/26 15:04:30 Initializing Terraform AWS Provider...
=== RUN   TestAccTransitGatewayDataSource_serial
=== PAUSE TestAccTransitGatewayDataSource_serial
=== CONT  TestAccTransitGatewayDataSource_serial
=== RUN   TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_Filter
=== PAUSE TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_Filter
=== RUN   TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_TransitGatewayIdAndDxGatewayId
=== PAUSE TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_TransitGatewayIdAndDxGatewayId
=== CONT  TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_Filter
=== CONT  TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_TransitGatewayIdAndDxGatewayId
--- PASS: TestAccTransitGatewayDataSource_serial (0.00s)
    --- PASS: TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_TransitGatewayIdAndDxGatewayId (1319.43s)
    --- PASS: TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_Filter (1319.54s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ec2        1319.824s

$

[github-actions]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccTransitGatewayDataSource_serial/DxGatewayAttachment' PKG=ec2
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.3 test ./internal/service/ec2/... -v -count 1 -parallel 20  -run=TestAccTransitGatewayDataSource_serial/DxGatewayAttachment -timeout 360m -vet=off
2025/01/28 07:56:04 Initializing Terraform AWS Provider...
=== RUN   TestAccTransitGatewayDataSource_serial
=== PAUSE TestAccTransitGatewayDataSource_serial
=== CONT  TestAccTransitGatewayDataSource_serial
=== RUN   TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_TransitGatewayIdAndDxGatewayId
=== PAUSE TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_TransitGatewayIdAndDxGatewayId
=== RUN   TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_Filter
=== PAUSE TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_Filter
=== CONT  TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_TransitGatewayIdAndDxGatewayId
=== CONT  TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_Filter
--- PASS: TestAccTransitGatewayDataSource_serial (0.00s)
    --- PASS: TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_TransitGatewayIdAndDxGatewayId (1426.04s)
    --- PASS: TestAccTransitGatewayDataSource_serial/DxGatewayAttachment_Filter (1426.26s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	1431.820s

[ewbankkit]

@acwwat Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v5.85.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!