skip robot tests on iOS and android, refs #17819, #17820
avoid timeout on CheckBoxMixin test, refs #17819, #17820
Convert most remaining AMD test files to use boilerplate.js.
Boilerplate.js sets the locale to en-us, avoiding spurious test
failures on non-US locales.

Refs #17818.
hardcode test locale to en-us to avoid spurious failure, refs #17818