[canvaskit] Skip problematic skp

This skp started causing
Perf-Debian10-EMCC-GCE-CPU-AVX2-wasm-Release-All-Puppeteer_RenderSKP
to timeout.

Change-Id: I248b4be8f2287ecb16969f71f985acd794bd8d11
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/390298
Reviewed-by: Ravi Mistry <rmistry@google.com>

infra/bots/task_drivers/perf_puppeteer_render_skps/perf_puppeteer_render_skps.go

@@ -145,6 +145,8 @@ var cpuSkiplist = []string{
 	"desk_carsvg.skp",
 	// This started timing out the week of Feb 10, 2021 on CPU.
 	"desk_micrographygirlsvg.skp",
+	// Started timing out the week of Mar 25 2021 on CPU.
+	"desk_motionmarkpaths.skp",
 }
 var gpuSkiplist = []string{}