fix(tempest): Change error type

[tobias-wilfert]

Changed error type to be nicer after feedback from @vgrozdanic. This is done to now match the format that is returned by Tempest.

[vgrozdanic]

🚀

[vgrozdanic]

It might be also good to introduce enum with all of the error types, then you don't have to hardcode the string in a multiple places

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
23537	1	23536	276

View the full list of 1 ❄️ flaky tests

tests.sentry.api.endpoints.test_organization_events_trends_v2.OrganizationEventsTrendsStatsV2EndpointTest::test_two_projects_same_transaction_split_queries

Flake rate in main: 9.43% (Passed 48 times, Failed 5 times)

Stack Traces | 2.28s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_events_trends_v2.py#x1B[0m:414: in test_two_projects_same_transaction_split_queries
    assert len(trends_call_args_data_1[f"{project1.id},foo bar*"]) > 0
#x1B[1m#x1B[31mE   KeyError: '4555395139895300,foo bar*'#x1B[0m

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