d/ssm_document - dont generate arn for aws managed docs

[DrFaust92]

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Closes #19674

Output from acceptance testing:

$ make testacc TESTS=TestAccSSMDocumentDataSource_ PKG=ssm

--- PASS: TestAccSSMDocumentDataSource_awsManaged (23.03s)
--- PASS: TestAccSSMDocumentDataSource_basic (52.19s)

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccSSMDocumentDataSource_ PKG=ssm
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ssm/... -v -count 1 -parallel 20 -run='TestAccSSMDocumentDataSource_'  -timeout 180m
=== RUN   TestAccSSMDocumentDataSource_basic
=== PAUSE TestAccSSMDocumentDataSource_basic
=== RUN   TestAccSSMDocumentDataSource_awsManaged
=== PAUSE TestAccSSMDocumentDataSource_awsManaged
=== CONT  TestAccSSMDocumentDataSource_basic
=== CONT  TestAccSSMDocumentDataSource_awsManaged
--- PASS: TestAccSSMDocumentDataSource_awsManaged (12.34s)
--- PASS: TestAccSSMDocumentDataSource_basic (26.83s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ssm	30.591s

[ewbankkit]

@DrFaust92 Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v4.7.0 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]

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