User Feedback: Restrict associated events to 30 minute recency

[armcknight]

Description

Relay will reject feedback envelopes that contain an associated event id that occurred more than 30 minutes prior to the feedback's timestamp.

We don't yet have a crash report trigger for this, but will need to consider the delay between crash time and relaunch time to decide whether or not to pop the form dialog for it.

I can't think of any other scenarios we should consider here because associated IDs aren't currently linked in the feedback forms envelopes. Relay session IDs are linked at the time the submit button is hit so we're not in danger of grabbing a replay session ID and then letting it age out if the user leaves the feedback form open for more than 30 minutes.

[philipphofmann]

Two ideas to fix this:

1. Relay could accept such user feedback cause that's a valid use case on mobile.
2. The SDK could modify the user feedback timestamp so it's close to the crash and doesn't exceed 30 minutes.