Run Wasm browser sample on Helix

[MaximLipnin]

This is a continuation of #45768 for the browser sample.
Which sample to run depends on the Helix scenario:

• the console sample runs under normal scenario;
• the browser sample runs under WasmTestOnBrowser scenario.

Relates to #43865

[radical]

There are a few things to note here:

1. xharness wasm test-browser is used with WasmTestRunner in other tests, and that expects to run an assembly with the Xunit tests.
2. Another way to use the test-browser command would be to directly run an assembly in the browser, like the sample here. but then we need to somehow perform the test. In this case, we can test for the result of the simple TestMeaning() function call, as is displayed in the html anyway.
   • but XHarness is expecting the test result in a certain way, so that it can pass/fail the run

I implemented (2) in c9dccc0 .
If we want to add more tests/checks on the same sample, then adding Xunit tests would be preferable.

/cc @steveisok @lewing @akoeplinger

[MaximLipnin]

Rebased the latest master to pick up Steve's AOT changes

[akoeplinger]

Looks good to me but yeah ideally we'd have a similar functionality in xharness like we do for iOS/Android where we pass the --expected-exit-code instead of expecting an xunit test run+result. But that can be cleaned up later :)