resource/aws_api_gateway_stage: Remove deprecated (helper/schema.ResourceData).Partial() and (helper/schema.ResourceData).SetPartial() (#12467)
resource/aws_api_gateway_stage: Remove deprecated (helper/schema.ResourceData).Partial() and (helper/schema.ResourceData).SetPartial() (#12467)

Reference: https://github.com/terraform-providers/terraform-provider-aws/issues/12083
Reference: https://github.com/terraform-providers/terraform-provider-aws/issues/12087

Previously:

```
aws/resource_aws_api_gateway_stage.go:134:2: R007: deprecated (schema.ResourceData).Partial
aws/resource_aws_api_gateway_stage.go:178:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:179:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:180:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:181:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:182:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:183:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:205:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:206:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:207:2: R007: deprecated (schema.ResourceData).Partial
aws/resource_aws_api_gateway_stage.go:291:2: R007: deprecated (schema.ResourceData).Partial
aws/resource_aws_api_gateway_stage.go:398:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:399:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:400:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:401:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:402:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:428:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:429:2: R008: deprecated (schema.ResourceData).SetPartial
aws/resource_aws_api_gateway_stage.go:430:2: R007: deprecated (schema.ResourceData).Partial
```

Output from acceptance testing:

```
--- PASS: TestAccAWSAPIGatewayStage_accessLogSettings (260.87s)
--- PASS: TestAccAWSAPIGatewayStage_accessLogSettings_kinesis (388.36s)
--- PASS: TestAccAWSAPIGatewayStage_basic (469.04s)
```
terraform-providers/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,kjmkznr/terraform-provider-aws