spike(sentry apps): Spike out what context manager usage will look for ext. requests

[Christinarlong]

Using SelectRequester as the example here:

Context: SelectRequester is one our most used dataclasses as it queries the 3p integrator to get the 'options' they want us to display for the 'Select' input/dropdown field. Here we're just wrapping the .run()/driver function in the context manager. We add halts for the failures as the errors are usually from the 3p giving us a bad URL or incorrect format.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
23718	1	23717	292

View the top 1 failed test(s) by shortest run time

tests.sentry.sentry_apps.external_requests.test_select_requester.TestSelectRequester::test_invalid_response_missing_value

Stack Traces | 4.49s run time

#x1B[1m#x1B[.../sentry_apps/external_requests/test_select_requester.py#x1B[0m:114: in test_invalid_response_missing_value
    ).run()
#x1B[1m#x1B[.../sentry_apps/external_requests/select_requester.py#x1B[0m:119: in run
    return formatted_response
#x1B[1m#x1B[31mE   UnboundLocalError: cannot access local variable 'formatted_response' where it is not associated with a value#x1B[0m

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