dev/sg: recover and format panics, add bug report template

Created by: bobheadxi

Analytics hooks now recover from panics when executing an action - this covers most command-running cases. Also adds a similar handler in Before, where a lot of stuff happens, in case we run into panics there.

The stacktrace is customized to only include dev/sg components, for user-friendliness.

Part of https://github.com/sourcegraph/sourcegraph/issues/33447, related to https://github.com/sourcegraph/sourcegraph/issues/32562

Test plan

Added panics in various places and checked output + analytics logs

Example: