Convention used to define attachment in screenshot is strict and not obvious

[bruno-garcia]

Lots of customers capture screenshots but when they open Sentry, they see nothing in the screenshot tab.
Everything is in the All Attachments tab with Type: Other.

That's because our convention to mark something a screenshot is very strict.

Suggestions:

1. In the product, in the screenshots tab. Show a (i) that on hover shows that makes an attachment a screenshot.
2. Relax the definition of screenshot. How about endsWith(screenshot) or contains ?

[getsantry]

Routing to @getsentry/product-owners-issues for triage ⏲️