add log for skip reasons

Summary:
X-link: pytorch/pytorch#148797

Add skip reasons to dynamo_compile so we can know popular skip reasons for cudagraph

Reviewed By: masnesral

Differential Revision: D70820791

fbshipit-source-id: 296583e847c50af716ed747dc9a82adf1bc1ac19

Author: BoyuanFeng

userbenchmark/dynamo/dynamobench/_dynamo/utils.py

@@ -1231,6 +1231,7 @@ class CompilationMetrics:
     num_graph_breaks: Optional[int] = None
     triton_kernel_compile_times_us: Optional[str] = None
     ir_count: Optional[int] = None
+    cudagraph_skip_reason: Optional[str] = None
 
     @classmethod
     def create(cls, metrics: dict[str, Any]):