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.

cmd/ingest.go

@@ -55,7 +55,7 @@ The --recent flag will only consider files with a modification date within the l
 						logger.Log().Errorf("%s: %s", path, err.Error())
 						return nil
 					}
-					defer f.Close() // #nosec
+					defer func() { _ = f.Close() }()
 
 					body, err := io.ReadAll(f)
 					if err != nil {