internal/sweep: Skip InternalServerErrorException

```
2025/07/29 17:03:08   - aws_prometheus_scraper: listing "aws_prometheus_scraper" (us-west-1): operation error amp: ListScrapers, exceeded maximum number of attempts, 5, https response error StatusCode: 500, RequestID: 7fcd350e-6973-48a1-8c10-9d3458fc856c, api error InternalServerErrorException: Internal server error
```

Author: jar-b

internal/sweep/awsv2/skip.go

@@ -45,6 +45,10 @@ func SkipSweepError(err error) bool {
 	if tfawserr.ErrMessageContains(err, "HttpConnectionTimeoutException", "Failed to connect to") {
 		return true
 	}
+	// Example (amp): InternalServerErrorException: Internal server error
+	if tfawserr.ErrMessageContains(err, "InternalServerErrorException", "Internal server error") {
+		return true
+	}
 	// Example (GovCloud): InvalidAction: DescribeDBProxies is not available in this region
 	if tfawserr.ErrMessageContains(err, "InvalidAction", "is not available") {
 		return true