chore(sentry apps): New error design for external request flow

[Christinarlong]

No description provided.

[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
23573	2	23571	275

View the top 2 failed tests by shortest run time

tests.sentry.incidents.endpoints.test_organization_alert_rule_details.AlertRuleDetailsGetEndpointTest::test_with_unresponsive_sentryapp

Stack Traces | 4.73s run time

#x1B[1m#x1B[.../incidents/endpoints/test_organization_alert_rule_details.py#x1B[0m:572: in test_with_unresponsive_sentryapp
    assert resp.status_code == 200
#x1B[1m#x1B[31mE   assert 500 == 200#x1B[0m
#x1B[1m#x1B[31mE    +  where 500 = <Response status_code=500, "application/json">.status_code#x1B[0m

tests.sentry.api.endpoints.test_project_rule_details.ProjectRuleDetailsTest::test_with_unresponsive_sentryapp

Stack Traces | 5.8s run time

#x1B[1m#x1B[.../api/endpoints/test_project_rule_details.py#x1B[0m:374: in test_with_unresponsive_sentryapp
    response = self.get_success_response(
#x1B[1m#x1B[.../sentry/testutils/cases.py#x1B[0m:686: in get_success_response
    assert_status_code(response, status_code)
#x1B[1m#x1B[.../sentry/testutils/asserts.py#x1B[0m:40: in assert_status_code
    assert minimum <= response.status_code < maximum, (
#x1B[1m#x1B[31mE   AssertionError: (500, b'{"detail":"Internal Error","errorId":null}')#x1B[0m
#x1B[1m#x1B[31mE   assert 500 < 201#x1B[0m
#x1B[1m#x1B[31mE    +  where 500 = <Response status_code=500, "application/json">.status_code#x1B[0m

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[Christinarlong]

These are duplicate tests that test cases already covered in prev ones