tests/resource/aws_lb_listener: Use internal implementation for TLS key/certificate
tests/resource/aws_lb_listener: Use internal implementation for TLS key/certificate

Reference: https://github.com/terraform-providers/terraform-provider-aws/issues/10023

Output from acceptance testing:

```
--- PASS: TestAccAWSLBListener_https (193.49s)
--- PASS: TestAccAWSLBListener_DefaultAction_Order_Recreates (202.01s)
--- PASS: TestAccAWSLBListener_cognito (202.92s)
--- PASS: TestAccAWSLBListener_oidc (214.41s)
--- PASS: TestAccAWSLBListener_DefaultAction_Order (223.52s)
--- PASS: TestAccAWSLBListener_Protocol_Tls (340.53s)
```

terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws