Remove extra retry and cleanup errors for deleting api gateway resource

[ryndaniels]

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Related #7873

Release note for CHANGELOG:

BUG FIXES:
* resource/aws_api_gateway_resource: Removes an extraneous retry when deleting API gateway resource

Output from acceptance testing:

make testacc TESTARGS="-run=TestAccAWSAPIGatewayResource"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -parallel 20 -run=TestAccAWSAPIGatewayResource -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
=== RUN   TestAccAWSAPIGatewayResource_basic
=== PAUSE TestAccAWSAPIGatewayResource_basic
=== RUN   TestAccAWSAPIGatewayResource_update
=== PAUSE TestAccAWSAPIGatewayResource_update
=== CONT  TestAccAWSAPIGatewayResource_basic
=== CONT  TestAccAWSAPIGatewayResource_update
--- PASS: TestAccAWSAPIGatewayResource_basic (30.35s)
--- PASS: TestAccAWSAPIGatewayResource_update (62.21s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       63.059s

[bflad]

Another one bites the dust! LGTM 🚀

--- PASS: TestAccAWSAPIGatewayResource_basic (8.28s)
--- PASS: TestAccAWSAPIGatewayResource_update (65.99s)

[bflad]

This has been released in version 2.16.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[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!