Chore: Refactor error handling and resource management across multiple files (golangci-lint)

- Updated error handling to use the error return value for resource closures in tests and functions, ensuring proper error reporting.
- Replaced direct calls to `Close()` with deferred functions that handle errors gracefully.
- Improved readability by using `strings.ReplaceAll` instead of `strings.Replace` for string manipulation.
- Enhanced network connection handling by adding default cases for unsupported network types.
- Updated HTTP response handling to use the appropriate status codes and error messages.
- Removed unused variables and commented-out code to clean up the codebase.

server/webhook/webhook.go

@@ -22,7 +22,7 @@ var (
 )
 
 // Send will post the MessageSummary to a webhook (if configured)
-func Send(msg interface{}) {
+func Send(msg any) {
 	if config.WebhookURL == "" {
 		return
 	}
@@ -70,7 +70,7 @@ func Send(msg interface{}) {
 				return
 			}
 
-			defer resp.Body.Close()
+			_ = resp.Body.Close()
 		})
 	}()
 }