e2e/integration test setup

[hahn-kev]

We'd like to setup a an integration and e2e test framework. We've used Playwright in the past and that seems like a good plan to use unless we run into some major downsides.

It does look like we can write tests in .Net or in TS, it's up to us, I'm not really sure what's best here since testing out frontend seems like it might be best in TS. However testing the .Net API would probably be easiest in .Net since we could use some of our dotnet code to inject testing data directly into the db.

For this issue I'd consider it done when we have 2 tests, one to test the login page:

1. type in user name and password
2. click login button
3. verify landing on user dashboard

and an API test:

1. call the FLEx projects endpoint, this requires an explicit user and password to be passed in.
2. Verify some results

we also at some point want a test for S&R but that can be tracked in #32 as it's a bigger task to tackle.

[rmunn]

Classic site's E2E tests has several Page base classes that, among other things, used a selector after nav to ensure that you really did land on the page that you were trying to navigate to. Copying that approach might serve us well as we get started here.

[hahn-kev]

These are actually now all done with #139 being merged in and the S&R tests that Robin wrote.