Update prod builders. (#63492)

* Update prod builders.

This is to make the builders show up in the flutter dashboard.

Bug:
  https://github.com/flutter/flutter/issues/63256

* Add mac and windows bots.

* Fix flaky flag.

* Rename taskName as task_name.

dev/prod_builders.json

 {
-   "builders":[
+   "builders": [
       {
-         "name":"Linux",
-         "repo":"flutter",
-         "taskName":"linux_bot"
+         "name": "Linux build_tests",
+         "repo": "flutter",
+         "task_name": "build_tests",
+         "flaky": false
       },
       {
-         "name":"Mac",
-         "repo":"flutter",
-         "taskName":"mac_bot"
+         "name": "Linux framework_tests",
+         "repo": "flutter",
+         "task_name": "linux_framework_tests",
+         "flaky": false
       },
       {
-         "name":"Windows",
-         "repo":"flutter",
-         "taskName":"windows_bot"
+         "name": "Linux hostonly_devicelab_tests",
+         "repo": "flutter",
+         "task_name": "hostonly_devicelab_tests",
+         "flaky": false
       },
       {
-         "name":"Linux Coverage",
-         "repo":"flutter"
+         "name": "Linux tool_tests",
+         "repo": "flutter",
+         "task_name": "tool_tests",
+         "flaky": false
+      },
+      {
+         "name": "Linux web_tests",
+         "repo": "flutter",
+         "task_name": "web_tests",
+         "flaky": true
+      },
+      {
+         "name": "Mac",
+         "repo": "flutter",
+         "task_name": "mac_bot",
+         "flaky": false
+      },
+      {
+         "name": "Windows",
+         "repo": "flutter",
+         "task_name": "windows_bot",
+         "flaky": false
       }
    ]
 }