Adds Queued as a StackSet Operating Waiter Pending state

[georgealton]

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A StackSet using Managed Execution can internally queue Operations before they're executed.

When doing so the status of the Operation is set to Queued.

Initially, concurrent Operations may also be set to Queued, until they're deemed safe to start.

The waiter doesn't handle the case where the Operation status is Queued. After which terraform loses track of the Operation.

This treats the Queued status as a 'Pending' status in the waiter. Allowing terraform to successfully track Queued Operations, until they reach the Target state.

[github-actions]

Thank you for your contribution! 🚀

Please note that the CHANGELOG.md file contents are handled by the maintainers during merge. This is to prevent pull request merge conflicts, especially for contributions which may not be merged immediately. Please see the Contributing Guide for additional pull request review items.

Remove any changes to the CHANGELOG.md file and commit them in this pull request to prevent delays with reviewing and potentially merging this pull request.

[ewbankkit]

AWS documentation: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/stacksets-concepts.html#stackset-status-codes.

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccCloudFormationStackSet_basic PKG=cloudformation
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudformation/... -v -count 1 -parallel 20 -run='TestAccCloudFormationStackSet_basic' -timeout 180m
=== RUN   TestAccCloudFormationStackSet_basic
=== PAUSE TestAccCloudFormationStackSet_basic
=== CONT  TestAccCloudFormationStackSet_basic
--- PASS: TestAccCloudFormationStackSet_basic (22.56s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudformation	27.431s

[github-actions]

This functionality has been released in v4.9.0 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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