feat(span-first): Support `before_send_span` · getsentry/sentry-python@8aca36a

Canceling since a higher priority waiting request for Test Cloud-ivana/span-first-before-send-span exists

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unable to access 'https://github.com/getsentry/sentry-python/': The requested URL returned error: 500

Canceling since a higher priority waiting request for Test Cloud-ivana/span-first-before-send-span exists

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