feat(explore): Add equation support to the spans dataset

[wmak]

• This updates the spans dataset to support equations in the same format that discover supports them today

[wmak]

just checking CI

[codecov]

❌ 44 Tests Failed:

Tests completed	Failed	Passed	Skipped
25981	44	25937	211

View the top 3 failed test(s) by shortest run time

tests.sentry.api.endpoints.test_organization_traces.OrganizationTracesEAPEndpointTest::test_use_separate_referrers

Stack Traces | 2.49s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_traces.py#x1B[0m:2551: in test_use_separate_referrers
    assert response.status_code == 200, response.data
#x1B[1m#x1B[31mE   AssertionError: {'detail': 'Internal Error', 'errorId': None}#x1B[0m
#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_organization_profiling_profiles.OrganizationProfilingFlamegraphTest::test_queries_profile_candidates_from_spans

Stack Traces | 3.13s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_profiling_profiles.py#x1B[0m:898: in test_queries_profile_candidates_from_spans
    mock_proxy_profiling_service.assert_called_once_with(
#x1B[1m#x1B[.../hostedtoolcache/Python/3.13.1.../x64/lib/python3.13/unittest/mock.py#x1B[0m:988: in assert_called_once_with
    raise AssertionError(msg)
#x1B[1m#x1B[31mE   AssertionError: Expected 'proxy_profiling_service' to be called once. Called 0 times.#x1B[0m

tests.sentry.api.endpoints.test_organization_traces.OrganizationTracesEAPEndpointTest::test_use_first_span_for_name

Stack Traces | 3.83s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_traces.py#x1B[0m:469: in test_use_first_span_for_name
    assert response.status_code == 200, response.data
#x1B[1m#x1B[31mE   AssertionError: {'detail': 'Internal Error', 'errorId': None}#x1B[0m
#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

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