Audit/cleanup celery integration

[linear]

@neelshah noticed during a pairing session that there may be some outdated patching happening here: https://github.com/getsentry/sentry-python/blob/8ae6b3f9beb9ff9fc09188641b3e9f924f1bad15/sentry_sdk/integrations/celery/_init_.py#L422-L425

Investigate if Celery still has this branching logic for how it runs tasks and, if not, update this

[linear]

PY-2088