Fix: unexpected state 'rebooting' when creating Multi A-Z rds cluster

[matharoo]

This PR adds the rebooting state to the list of allowable pending states when creating a Multi A-Z RDS cluster.

Affected resource: aws_rds_cluster

Closes #24721

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Output from acceptance testing:
[ Need help with running test make testacc TESTS=TestAccRDSCluster_basic PKG=rds ]:

$ make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions]

Welcome @matharoo 👋

It looks like this is your first Pull Request submission to the Terraform AWS Provider! If you haven’t already done so please make sure you have checked out our CONTRIBUTING guide and FAQ to make sure your contribution is adhering to best practice and has all the necessary elements in place for a successful approval.

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Thanks again, and welcome to the community! 😃

[matharoo]

Hello @ewbankkit can i please get this reviewed and merged? I would really appreciate that, this is a blocker for us.

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccRDSCluster_basic' PKG=rds ACCTEST_PARALLELISM=3
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 3  -run=TestAccRDSCluster_basic -timeout 180m
=== RUN   TestAccRDSCluster_basic
=== PAUSE TestAccRDSCluster_basic
=== CONT  TestAccRDSCluster_basic
--- PASS: TestAccRDSCluster_basic (125.03s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	131.972s

[github-actions]

This functionality has been released in v4.23.0 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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