Fix monster performance benchmark run on Windows

The scene contains some interesting names, which requires to be
written as utf-8. And on Windows file descriptor is not guaranteed
to be using utf-8. Or, will error out if the invalid utf-8 sequence
is written.

This change makes it so running benchmarks on windows it fully successful.

Pull Request: https://projects.blender.org/blender/blender/pulls/108982

tests/performance/api/environment.py

@@ -175,7 +175,7 @@ class TestEnvironment:
         if self.log_file:
             if not self.log_file.exists():
                 self.log_file.parent.mkdir(parents=True, exist_ok=True)
-            f = open(self.log_file, 'a')
+            f = open(self.log_file, 'a', encoding='utf-8', errors='ignore')
             f.write('\n' + ' '.join([str(arg) for arg in args]) + '\n\n')
 
         env = os.environ