"Run Slow Unit Tests" Action has been failing for some time

[aaraney]

As @jarq6c mentioned in #216, the "Run Slow Unit Tests" Action has been failing for some time. I did a little bit of digging and the issue is twofold. First, the svi_client is missing a testing dependency, pytest-aiohttp. We use this dependecny in _restclient and nwis_client to provide an asyncio loop to tests. This is the cause of the RuntimeError: There is no current event loop in thread 'MainThread'. errors in the slow unit tests. Second, in general the svi_client integration tests are a little brittle. We end up hitting an esri feature server repeatedly upwards of 600 times. If requests are made too quickly, the server just rejects the requests.

[jarq6c]

Do we need to hit an ESRI server 600 times?

[aaraney]

@jarq6c, no and that would remedy this. I think just hitting each endpoint is enough.