remove bringup status for recently re-subsharded targets (flutter#158217)

Cleans up flutter#158196 and flutter#158146

<details>

<summary> Pre-launch checklist </summary> 

</details>

Author: andrewkolos

.ci.yaml

@@ -1170,7 +1170,6 @@ targets:
       - .ci.yaml
 
   - name: Linux tool_integration_tests_1_6
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -1197,7 +1196,6 @@ targets:
       - .ci.yaml
 
   - name: Linux tool_integration_tests_2_6
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -1224,7 +1222,6 @@ targets:
       - .ci.yaml
 
   - name: Linux tool_integration_tests_3_6
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -1251,7 +1248,6 @@ targets:
       - .ci.yaml
 
   - name: Linux tool_integration_tests_4_6
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -1278,7 +1274,6 @@ targets:
       - .ci.yaml
 
   - name: Linux tool_integration_tests_5_6
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -1305,7 +1300,6 @@ targets:
       - .ci.yaml
 
   - name: Linux tool_integration_tests_6_6
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -5418,7 +5412,6 @@ targets:
       task_name: run_release_test_macos
 
   - name: Windows build_tests_1_9
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -5437,7 +5430,6 @@ targets:
         ["framework", "hostonly", "shard", "windows"]
 
   - name: Windows build_tests_2_9
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -5456,7 +5448,6 @@ targets:
         ["framework", "hostonly", "shard", "windows"]
 
   - name: Windows build_tests_3_9
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -5475,7 +5466,6 @@ targets:
         ["framework", "hostonly", "shard", "windows"]
 
   - name: Windows build_tests_4_9
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -5494,7 +5484,6 @@ targets:
         ["framework", "hostonly", "shard", "windows"]
 
   - name: Windows build_tests_5_9
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -5513,7 +5502,6 @@ targets:
         ["framework", "hostonly", "shard", "windows"]
 
   - name: Windows build_tests_6_9
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -5532,7 +5520,6 @@ targets:
         ["framework", "hostonly", "shard", "windows"]
 
   - name: Windows build_tests_7_9
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -5551,7 +5538,6 @@ targets:
         ["framework", "hostonly", "shard", "windows"]
 
   - name: Windows build_tests_8_9
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
@@ -5570,7 +5556,6 @@ targets:
         ["framework", "hostonly", "shard", "windows"]
 
   - name: Windows build_tests_9_9
-    bringup: true
     recipe: flutter/flutter_drone
     timeout: 60
     properties: