Logs not fully ingested by Sentry from AWS lambdas

[AbhiPrasad]

See linear for more details: https://linear.app/getsentry/issue/JS-368/logs-not-fully-ingested-by-sentry-from-aws-lambdas

Logs are not being ingested from AWS Lambda, probably because of flushing issues.

[AbhiPrasad]

@andreiborza could you help take a look when you're back? Not super familiar with the aws lambda flushing stuff, I would have assumed Sentry.flush is good enough to get this working.