fix: use fp unwinding mode when running go test

Go does not produce .eh_frame sections needed for dwarf unwinding.
In dwarf mode, perf captures a stack snapshot that we can use to fall
back to frame pointer unwinding via framehop. However on arm64, the
snapshot is missing a key register (x29/FP) due to Go's non-standard
function calling convention, so the framehop fallback fails.

Using callgraph mode fp avoids this entirely: the kernel performs the
unwinding itself with full access to the stack.

Author: GuillaumeLagrange

src/executor/wall_time/perf/mod.rs

@@ -98,6 +98,8 @@ impl PerfRunner {
             (mode, None)
         } else if config.command.contains("cargo") {
             (UnwindingMode::Dwarf, None)
+        } else if config.command.contains("go test") {
+            (UnwindingMode::FramePointer, None)
         } else if config.command.contains("pytest")
             || config.command.contains("uv")
             || config.command.contains("python")