Benchmark: Add unit to time result and format it

When running tests via the cli, format the "time" result
with a unit. For time this is `s` for seconds.

For the graph, the same applies.

Pull Request: https://projects.blender.org/blender/blender/pulls/150690

tests/performance/api/graph.py

@@ -105,6 +105,8 @@ class TestGraph:
 
             if output.find("memory") != -1:
                 formatted_value = '%.2f MB' % (output_value / (1024 * 1024))
+            elif output == "time":
+                formatted_value = "%.4f s" % output_value
             else:
                 formatted_value = "%.4f" % output_value
 

tests/performance/benchmark.py

@@ -78,7 +78,7 @@ def print_row(config: api.TestConfig, entries: list, end='\n') -> None:
         output = entry.output
         result = ''
         if status in {'done', 'outdated'} and output:
-            result = '%.4fs' % output['time']
+            result = '%7.4f s' % output['time']
 
             if status == 'outdated':
                 result += " (outdated)"