tests/data-source/aws_ssm_parameter: Randomize naming (#12174)
tests/data-source/aws_ssm_parameter: Randomize naming (#12174)

Previous output from acceptance testing:

```
--- FAIL: TestAccAWSSsmParameterDataSource_basic (7.03s)
    testing.go:654: Step 0 error: errors during apply:

        Error: error creating SSM parameter: ParameterAlreadyExists: The parameter already exists. To overwrite this value, set the overwrite option in the request to true.
```

Output from acceptance testing:

```
--- PASS: TestAccAWSSsmParameterDataSource_fullPath (23.34s)
--- PASS: TestAccAWSSsmParameterDataSource_basic (39.00s)
```
terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws