[5.10] Revert "Only show command output in verbose mode (#7078)" (#7131)

Cherry-pick of #7130.

### Motivation:

With recent changes linker/compiler errors are silently consumed and
don't appear in stdout or stderr.

### Modifications:

This reverts commit 4c35491.

### Result:

Resolves #7114.

Author: MaxDesiatov

Diff for: Sources/Build/BuildOperationBuildSystemDelegateHandler.swift

@@ -790,10 +790,8 @@ final class BuildOperationBuildSystemDelegateHandler: LLBuildBuildSystemDelegate
         queue.async {
             if let buffer = self.nonSwiftMessageBuffers[command.name] {
                 self.progressAnimation.clear()
-                if self.logLevel.isVerbose {
-                    self.outputStream.send(buffer)
-                    self.outputStream.flush()
-                }
+                self.outputStream.send(buffer)
+                self.outputStream.flush()
                 self.nonSwiftMessageBuffers[command.name] = nil
             }
         }