fixing invalidDBInstanceState on proxy target registration

[nikemeal]

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This PR is a direct clone of #19096 but updated to edit the new file in the new location. All credit to https://github.com/tatodorov for the original PR

[github-actions]

Welcome @nikemeal 👋

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.

Also take a look at our FAQ which details how we prioritize Pull Requests for inclusion.

Thanks again, and welcome to the community! 😃

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccRDSProxyTarget_' PKG=rds ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 2  -run=TestAccRDSProxyTarget_ -timeout 180m
=== RUN   TestAccRDSProxyTarget_instance
=== PAUSE TestAccRDSProxyTarget_instance
=== RUN   TestAccRDSProxyTarget_cluster
=== PAUSE TestAccRDSProxyTarget_cluster
=== RUN   TestAccRDSProxyTarget_disappears
=== PAUSE TestAccRDSProxyTarget_disappears
=== CONT  TestAccRDSProxyTarget_instance
=== CONT  TestAccRDSProxyTarget_disappears
--- PASS: TestAccRDSProxyTarget_disappears (663.46s)
=== CONT  TestAccRDSProxyTarget_cluster
--- PASS: TestAccRDSProxyTarget_instance (669.64s)
--- PASS: TestAccRDSProxyTarget_cluster (751.35s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	1418.958s

[ewbankkit]

@nikemeal Thanks for the contribution 🎉 👏.

[ewbankkit]

% make golangci-lint
==> Checking source code with golangci-lint...

[github-actions]

This functionality has been released in v4.16.0 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]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.