Relay doesn't add outcomes/meta info if attachment is too large

[bruno-garcia]

When an envelope with an event + attachment is sent, but the attachment is dropped due to being too large.
How about we annotate the event ("had an attachment of N MB (if we know the size, I believe we cut the stream so..) but got dropped)

Relates to:

• Memory dump detection: dump file dropped because it's too big sentry-dotnet#4007

This is a new feature of the .NET SDK, to get a heap dump (counts of allocated objects per type). I'm hoping to add this to the preview button so you can check the dump in Sentry: https://github.com/getsentry/dotnet-heapview
But the dump was too large and got dropped.

The SDK logs go to GCP (Symbol Collector) and I got:

2: 161153506
@l: "Warning"
@mt: "{0}: Attachment '{1}' dropped because it's too large ({2} bytes)."

but if it wasn't for me logging the Sentry SDK on a logging tool, I would have no idea what's going on

Replaces (private):

• https://github.com/getsentry/team-ingest/issues/651