Final retry deleting iot types

[ryndaniels]

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Relates #7873

Release note for CHANGELOG:

BUG FIXES:
* resource/aws_iot_thing_type: Final retry after timeout deleting IOT thing type

Output from acceptance testing:

$ make testacc TESTARGS="-run=TestAccAWSIotThingType"      
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -parallel 20 -run=TestAccAWSIotThingType -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
=== RUN   TestAccAWSIotThingType_basic
=== PAUSE TestAccAWSIotThingType_basic
=== RUN   TestAccAWSIotThingType_full
=== PAUSE TestAccAWSIotThingType_full
=== CONT  TestAccAWSIotThingType_basic
=== CONT  TestAccAWSIotThingType_full
--- PASS: TestAccAWSIotThingType_basic (327.00s)
--- PASS: TestAccAWSIotThingType_full (343.43s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       347.034s

[bflad]

LGTM 🚀

--- PASS: TestAccAWSIotThingType_basic (314.87s)
--- PASS: TestAccAWSIotThingType_full (319.61s)

[ghost]

This has been released in version 2.25.0 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!