Move Linux_build_test tests from staging to prod (flutter#152877)

These have been migrated to mokey and have been consistently passing in staging.

Author: zanderso

.ci.yaml

@@ -2849,7 +2849,6 @@ targets:
 
   - name: Linux_build_test flutter_gallery__transition_perf
     recipe: devicelab/devicelab_drone_build_test
-    bringup: true
     presubmit: false
     timeout: 60
     properties:
@@ -2862,7 +2861,6 @@ targets:
 
   - name: Linux_build_test flutter_gallery__transition_perf_e2e
     recipe: devicelab/devicelab_drone_build_test
-    bringup: true
     presubmit: false
     timeout: 60
     properties:
@@ -2875,7 +2873,6 @@ targets:
 
   - name: Linux_build_test flutter_gallery__transition_perf_hybrid
     recipe: devicelab/devicelab_drone_build_test
-    bringup: true
     presubmit: false
     timeout: 60
     properties: