Design new playwright test project

[HaoK]

Goal of the E2E test project with playwright is to enable something like this:

MyTestBase : IAssemblyFixture<SomeContainer> { }

[Fact]
public async Task Stuff()
{
   var server = await ServerFixture.GetServerAsync(someRequirements);
   var client = await ClientFixture.GetBrowserAsync(differentRequirments);
}

Future goals

• Improve debuggability of tests
• Support WebView testability as well

Next steps

• @pranavkm will prototype server fixture
• @javiercn will improve current client/playwright functionality
• @HaoK will identify the set of quarantined tests to use as a baseline for comparison to measure improvements vs the old

Quarantined tests to try:
#25929
#23366
#29553