[ Tool ] Mark Linux_pixel_7pro linux_chrome_dev_mode as bringup (flutter#173646)

There seems to be issues with Chrome flakily either having too many open
tabs or none at all. This needs to be investigated further and shouldn't
block the tree.

Related issue: flutter#173696

Author: bkonyi

.ci.yaml

@@ -3066,6 +3066,7 @@ targets:
       task_name: large_image_changer_perf_android
 
   - name: Linux_pixel_7pro linux_chrome_dev_mode
+    bringup: true
     recipe: devicelab/devicelab_drone
     presubmit: false
     timeout: 60