Temporarily disable NexusLowRes, version=29 (#135785)

There are too many flakes to leave this version enabled. Temporarily disabled and following up with FTL.

*List which issues are fixed by this PR. You must list at least one issue.*
Related to https://github.com/flutter/flutter/issues/135784

*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

@@ -450,6 +450,8 @@ targets:
         ]
       # TODO(flutter/flutter#123331): This device is flaking.
       # "--device", "model=Nexus6P,version=25",
+      # TODO(flutter/flutter#135784): This device is flaking.
+      # "--device", "model=NexusLowRes,version=29",
       virtual_devices: >-
         [
           "--device", "model=Nexus5,version=21",
@@ -457,8 +459,7 @@ targets:
           "--device", "model=Nexus5,version=23",
           "--device", "model=Nexus5,version=24",
           "--device", "model=Nexus6P,version=26",
-          "--device", "model=Nexus6P,version=27",
-          "--device", "model=NexusLowRes,version=29"
+          "--device", "model=Nexus6P,version=27"
         ]
 
   - name: Linux firebase_android_embedding_v2_smoke_test
@@ -480,14 +481,15 @@ targets:
         ]
       # TODO(flutter/flutter#123331): This device is flaking.
       # "--device", "model=Nexus6P,version=25",
+      # TODO(flutter/flutter#135784): This device is flaking.
+      # "--device", "model=NexusLowRes,version=29",
       virtual_devices: >-
         [
           "--device", "model=Nexus5,version=21",
           "--device", "model=Nexus5,version=22",
           "--device", "model=Nexus5,version=23",
           "--device", "model=Nexus6P,version=26",
-          "--device", "model=Nexus6P,version=27",
-          "--device", "model=NexusLowRes,version=29"
+          "--device", "model=Nexus6P,version=27"
         ]
 
   - name: Linux firebase_release_smoke_test
@@ -509,14 +511,15 @@ targets:
         ]
       # TODO(flutter/flutter#123331): This device is flaking.
       # "--device", "model=Nexus6P,version=25",
+      # TODO(flutter/flutter#135784): This device is flaking.
+      # "--device", "model=NexusLowRes,version=29",
       virtual_devices: >-
         [
           "--device", "model=Nexus5,version=21",
           "--device", "model=Nexus5,version=22",
           "--device", "model=Nexus5,version=23",
           "--device", "model=Nexus6P,version=26",
-          "--device", "model=Nexus6P,version=27",
-          "--device", "model=NexusLowRes,version=29"
+          "--device", "model=Nexus6P,version=27"
         ]
 
   - name: Linux flutter_packaging_test