d/aws_globalaccelerator_accelerator: Add data globalaccelerator accelerator

[kumadee]

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Closes #13202

Output from acceptance testing:

$ make testacc TESTARGS="-run=TestAccAWSDataGlobalAcceleratorAccelerator_basic"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSDataGlobalAcceleratorAccelerator_basic -timeout 180m
=== RUN   TestAccAWSDataGlobalAcceleratorAccelerator_basic
=== PAUSE TestAccAWSDataGlobalAcceleratorAccelerator_basic
=== CONT  TestAccAWSDataGlobalAcceleratorAccelerator_basic
--- PASS: TestAccAWSDataGlobalAcceleratorAccelerator_basic (147.01s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       147.095s

[ewbankkit]

LGTM 🚀.

Commercial

% make testacc TEST=./aws TESTARGS='-run=TestAccAWSDataGlobalAcceleratorAccelerator_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSDataGlobalAcceleratorAccelerator_ -timeout 180m
=== RUN   TestAccAWSDataGlobalAcceleratorAccelerator_basic
=== PAUSE TestAccAWSDataGlobalAcceleratorAccelerator_basic
=== CONT  TestAccAWSDataGlobalAcceleratorAccelerator_basic
--- PASS: TestAccAWSDataGlobalAcceleratorAccelerator_basic (193.46s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	197.167s

GovCloud

% make testacc TEST=./aws TESTARGS='-run=TestAccAWSDataGlobalAcceleratorAccelerator_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSDataGlobalAcceleratorAccelerator_ -timeout 180m
=== RUN   TestAccAWSDataGlobalAcceleratorAccelerator_basic
=== PAUSE TestAccAWSDataGlobalAcceleratorAccelerator_basic
=== CONT  TestAccAWSDataGlobalAcceleratorAccelerator_basic
    resource_aws_globalaccelerator_accelerator_test.go:372: skipping acceptance testing: RequestError: send request failed
        caused by: Post "https://globalaccelerator.us-gov-west-1.amazonaws.com/": dial tcp: lookup globalaccelerator.us-gov-west-1.amazonaws.com: no such host
--- SKIP: TestAccAWSDataGlobalAcceleratorAccelerator_basic (24.42s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	27.518s

[ewbankkit]

@kumadee Thanks for the contribution 🎉 👏.
I pushed a couple of minor additions:

• Added a PreCheck function to ensure that the acceptance test is correctly skipped in AWS GovCloud
• Renamed the Global Accelerator resource documentation pages from *.markdown to *.html.markdown to fix the link check error

[github-actions]

This functionality has been released in v3.45.0 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!

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.