Add web_smoke_tests to luci. (#64331)

Bug:
  https://github.com/flutter/flutter/issues/64070

dev/prod_builders.json

@@ -60,6 +60,12 @@
          "task_name": "linux_web_integration_tests",
          "flaky": false
       },
+      {
+         "name":"Linux web_smoke_test",
+         "repo":"flutter",
+         "taskName":"linux_web_smoke_test",
+         "flaky":false
+      },
       {
          "name": "Mac",
          "repo": "flutter",

dev/try_builders.json

@@ -65,6 +65,13 @@
          "enabled":true,
          "run_if":["dev/", "packages/flutter/", "packages/flutter_test/", "packages/flutter_tools/", "packages/flutter_web_plugins/", "bin/"]
       },
+      {
+         "name":"Linux web_smoke_test",
+         "repo":"flutter",
+         "taskName":"linux_web_smoke_test",
+         "enabled":true,
+         "run_if":["examples/hello_world/**" ,"dev/**", "packages/flutter/**", "packages/flutter_test/**", "packages/flutter_tools/lib/src/test/**", "packages/flutter_web_plugins/**", "bin/**"]
+      },
       {
          "name": "Windows build_tests",
          "repo": "flutter",