Switch hot_mode_dev_cycle_linux__benchmark to run in postsubmit (#145343)

Switch hot_mode_dev_cycle_linux__benchmark to run in postsubmit.

*List which issues are fixed by this PR. You must list at least one issue. An issue is not required if the PR fixes something trivial like a typo.*
Part of https://github.com/flutter/flutter/issues/145242

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

.ci.yaml

@@ -2394,6 +2394,7 @@ targets:
   # linux motog4 benchmark
   - name: Linux_android hot_mode_dev_cycle_linux__benchmark
     recipe: devicelab/devicelab_drone
+    presubmit: false
     timeout: 60
     properties:
       tags: >