Contributing Documentation: Add section on error handling

[gdavison]

Add a section to documentation providing guidance on API error handling.

Among others, things to document:

• The Delete operation should not return an error when the resource is not found, but simply short circuit.
• Repeat the instructions to remove resource from state using d.SetId("") when not found during the Read operation
• Document use of resource.Retry(iamwaiter.PropagationTimeout, ...) for IAM eventual consistency

[bflad]

Since this is similar to other in progress provider documentation I'm already working on, picking this up as well. Most likely this will make sense as its own page, since there could be a lot of content that does not fit well with the existing information architecture of the contributing guide.

[bflad]

This information is now present in the following Contributing Guide documentation:

• https://github.com/hashicorp/terraform-provider-aws/blob/main/docs/contributing/error-handling.md
• https://github.com/hashicorp/terraform-provider-aws/blob/main/docs/contributing/retries-and-waiters.md

[ghost]

This has been released in version 3.28.0 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 for triage. Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!