resource/aws_gamelift_fleet: Check resource.TimeoutError on creation (#15526)
resource/aws_gamelift_fleet: Check resource.TimeoutError on creation (#15526)

Reference: https://github.com/terraform-providers/terraform-provider-aws/issues/12985

Output from acceptance testing:

```
--- PASS: TestAccAWSGameliftFleet_tags (1703.23s)
--- PASS: TestAccAWSGameliftFleet_basic (1707.75s)
--- PASS: TestAccAWSGameliftFleet_disappears (1725.93s)
--- PASS: TestAccAWSGameliftFleet_allFields (1763.86s)
```
terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws