feat(release health): Update snuba metrics to know about session unhandled state

[ryan953]

In support of https://www.notion.so/sentry/RFC-Session-Status-unhandled-2308b10e4b5d801d9805fece61533ac5#2308b10e4b5d80e9b312ecbea27a4af3 this change adds support for reading back sessions data with the unhandled status type.

Some of the places in the ui that read this value will be asking for it directly. In this PR we need to make the backend aware of the new type, and update the TypedDicts that will return it. Also we do some special handling to create some fields like unhandled_sessions and unhandled_users that will appear in the main section of the Release Details page.

All the existing tests in test_sessions.py and test_sessions_v2.py were updated to account for the new fields to be returned. I added some extra tests to make use of the new fields directly as well.

Related to REPLAY-580

[codecov]

❌ 8 Tests Failed:

Tests completed	Failed	Passed	Skipped
303	8	295	19

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

::tests.snuba.api.endpoints.test_organization_sessions

Stack Traces | 0s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_sessions.py#x1B[0m:10: in <module>
    from sentry.release_health.metrics import MetricsReleaseHealthBackend
#x1B[1m#x1B[.../sentry/release_health/metrics.py#x1B[0m:35: in <module>
    from sentry.release_health.metrics_sessions_v2 import run_sessions_query
#x1B[1m#x1B[.../sentry/release_health/metrics_sessions_v2.py#x1B[0m:263: in <module>
    class SumSessionField(CountField):
#x1B[1m#x1B[.../sentry/release_health/metrics_sessions_v2.py#x1B[0m:269: in SumSessionField
    SessionStatus.UNHANDLED: MetricField(None, SessionMRI.UNHANDLED.value),
#x1B[1m#x1B[31mE   AttributeError: type object 'SessionStatus' has no attribute 'UNHANDLED'#x1B[0m

::tests.snuba.api.endpoints.test_organization_sessions

Stack Traces | 0s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_sessions.py#x1B[0m:10: in <module>
    from sentry.release_health.metrics import MetricsReleaseHealthBackend
#x1B[1m#x1B[.../sentry/release_health/metrics.py#x1B[0m:35: in <module>
    from sentry.release_health.metrics_sessions_v2 import run_sessions_query
#x1B[1m#x1B[.../sentry/release_health/metrics_sessions_v2.py#x1B[0m:263: in <module>
    class SumSessionField(CountField):
#x1B[1m#x1B[.../sentry/release_health/metrics_sessions_v2.py#x1B[0m:269: in SumSessionField
    SessionStatus.UNHANDLED: MetricField(None, SessionMRI.UNHANDLED.value),
#x1B[1m#x1B[31mE   AttributeError: type object 'SessionStatus' has no attribute 'UNHANDLED'#x1B[0m

::tests.snuba.sessions.test_sessions

Stack Traces | 0s run time

#x1B[1m#x1B[.../snuba/sessions/test_sessions.py#x1B[0m:11: in <module>
    from sentry.release_health.metrics import MetricsReleaseHealthBackend
#x1B[1m#x1B[.../sentry/release_health/metrics.py#x1B[0m:35: in <module>
    from sentry.release_health.metrics_sessions_v2 import run_sessions_query
#x1B[1m#x1B[.../sentry/release_health/metrics_sessions_v2.py#x1B[0m:263: in <module>
    class SumSessionField(CountField):
#x1B[1m#x1B[.../sentry/release_health/metrics_sessions_v2.py#x1B[0m:269: in SumSessionField
    SessionStatus.UNHANDLED: MetricField(None, SessionMRI.UNHANDLED.value),
#x1B[1m#x1B[31mE   AttributeError: type object 'SessionStatus' has no attribute 'UNHANDLED'#x1B[0m

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[linear]

REPLAY-580 Update Sentry Backend to return and render new enum value

[cursor]

Bug: Missing Enum Member Causes Runtime Error

The SessionStatus enum is missing the UNHANDLED member. Code attempts to reference SessionStatus.UNHANDLED in _get_required_fields and the status_to_metric_field mappings for SumSessionField and CountUniqueSessionField, which will cause an AttributeError at runtime.

src/sentry/release_health/metrics_sessions_v2.py#L69-L77

sentry/src/sentry/release_health/metrics_sessions_v2.py

Lines 69 to 77 in a0d95ea

	class SessionStatus(Enum):
	ABNORMAL = "abnormal"
	CRASHED = "crashed"
	ERRORED = "errored"
	HEALTHY = "healthy"

src/sentry/release_health/metrics_sessions_v2.py#L268-L269

sentry/src/sentry/release_health/metrics_sessions_v2.py

Lines 268 to 269 in a0d95ea

	SessionStatus.ERRORED: MetricField(None, SessionMRI.ERRORED.value),
	SessionStatus.UNHANDLED: MetricField(None, SessionMRI.UNHANDLED.value),

src/sentry/release_health/metrics_sessions_v2.py#L244-L245

sentry/src/sentry/release_health/metrics_sessions_v2.py

Lines 244 to 245 in a0d95ea

	self.status_to_metric_field[SessionStatus.ERRORED],
	self.status_to_metric_field[SessionStatus.UNHANDLED],

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