[various] Disable sandbox in Chrome dart tests (#8909)

`flutter test` automatically disables sandbox in headless mode, but `dart test` does not, and the Linux CI bots no longer support the sandbox, so this turns it off explicitly for packages that don't rely on Flutter (and thus use `dart test`).

Fixes flutter/flutter#165664

Author: stuartmorgan-g

packages/cross_file/example/dart_test.yaml

@@ -0,0 +1,6 @@
+# See https://github.com/dart-lang/test/blob/master/pkgs/test/doc/configuration.md#arguments
+override_platforms:
+  chrome:
+    settings:
+      executable: chrome
+      arguments: --no-sandbox

packages/plugin_platform_interface/dart_test.yaml

@@ -0,0 +1,6 @@
+# See https://github.com/dart-lang/test/blob/master/pkgs/test/doc/configuration.md#arguments
+override_platforms:
+  chrome:
+    settings:
+      executable: chrome
+      arguments: --no-sandbox

packages/standard_message_codec/dart_test.yaml

@@ -0,0 +1,6 @@
+# See https://github.com/dart-lang/test/blob/master/pkgs/test/doc/configuration.md#arguments
+override_platforms:
+  chrome:
+    settings:
+      executable: chrome
+      arguments: --no-sandbox

packages/vector_graphics_codec/dart_test.yaml

@@ -0,0 +1,6 @@
+# See https://github.com/dart-lang/test/blob/master/pkgs/test/doc/configuration.md#arguments
+override_platforms:
+  chrome:
+    settings:
+      executable: chrome
+      arguments: --no-sandbox

third_party/packages/path_parsing/dart_test.yaml

@@ -0,0 +1,6 @@
+# See https://github.com/dart-lang/test/blob/master/pkgs/test/doc/configuration.md#arguments
+override_platforms:
+  chrome:
+    settings:
+      executable: chrome
+      arguments: --no-sandbox