r/aws_redshiftserverless_workgroup: Workgroup may be AVAILABLE when deletion starts

[ewbankkit]

Description

Adds AVAILABLE as a valid pending state during resource deletion.

Relations

Closes #29962.

Output from Acceptance Testing

% make testacc TESTARGS='-run=TestAccRedshiftServerlessWorkgroup_basic' PKG=redshiftserverless
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/redshiftserverless/... -v -count 1 -parallel 20  -run=TestAccRedshiftServerlessWorkgroup_basic -timeout 180m
=== RUN   TestAccRedshiftServerlessWorkgroup_basic
=== PAUSE TestAccRedshiftServerlessWorkgroup_basic
=== CONT  TestAccRedshiftServerlessWorkgroup_basic
--- PASS: TestAccRedshiftServerlessWorkgroup_basic (675.04s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/redshiftserverless	680.810s

[github-actions]

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[github-actions]

This functionality has been released in v5.5.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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