fix(developer): Sentry in Server should honour reporting settings

Fixes #9939.

Uses refactored KeymanSentry.ts in developer-utils and updates the
loader in Server to run from that.

The changes to tray.ts and friends are required to deal with a top-level
await issue with the shutdown call.

The top-level await issue is described in detail at
https://marc.durdin.net/2023/11/dynamic-import-on-node-js-with-circular-dependencies-leads-to-interesting-failure-modes/

tl;dr: shutdown needed to do a proper Sentry shutdown. The shutdown code
was in index.ts. This led to a circular dependency and caused a silent
and abrupt exit code 13 in Node.js. Moved shutdown code into shutdown.ts
to resolve this.