r/aws_imagebuilder_pipeline: add support for workflows

[kamilturek]

Description

This PR adds support for Image Builder workflows to Image Builder pipelines. Similar to #36953.

Relations

Closes #35045.

References

https://aws.amazon.com/about-aws/whats-new/2023/12/ec2-image-builder-image-workflows/
https://docs.aws.amazon.com/imagebuilder/latest/APIReference/API_CreateImagePipeline.html
https://docs.aws.amazon.com/imagebuilder/latest/APIReference/API_UpdateImagePipeline.html

Output from Acceptance Testing

% make testacc TESTARGS="-run=TestAccImageBuilderImagePipeline_workflow" PKG=imagebuilder
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.2 test ./internal/service/imagebuilder/... -v -count 1 -parallel 20  -run=TestAccImageBuilderImagePipeline_workflow -timeout 360m
=== RUN   TestAccImageBuilderImagePipeline_workflow
=== PAUSE TestAccImageBuilderImagePipeline_workflow
=== RUN   TestAccImageBuilderImagePipeline_workflowParameter
=== PAUSE TestAccImageBuilderImagePipeline_workflowParameter
=== CONT  TestAccImageBuilderImagePipeline_workflow
=== CONT  TestAccImageBuilderImagePipeline_workflowParameter
--- PASS: TestAccImageBuilderImagePipeline_workflow (43.19s)
--- PASS: TestAccImageBuilderImagePipeline_workflowParameter (43.69s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/imagebuilder       48.232s

[github-actions]

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