Add Sentry Configuration to application-server

[GODrums]

Motivation

Solves task 1 of #202.

Description

This PR adds Sentry to our Spring-Boot Server:

• https://sentry.ase.in.tum.de/organizations/aet/projects/hephaestus/?project=3
• set the Sentry DSN via sentry.dsn in the application-file
• disabled in spec-profile
• environment-based sample rate (adapted from Artemis, see SentryConfiguration.java):
  • test: 1.0 (for when we have real production-like test servers / preview deployments)
  • prod: 0.2
  • local: 0 (don't spam Sentry with errors during development)
• new env-var for the Hephaestus release (we should update this accordingly from time to time)

Testing Instructions

Example test errors:

• https://sentry.ase.in.tum.de/share/issue/18f5961403d34efc90d23356f8ddfa11/
• https://sentry.ase.in.tum.de/share/issue/5067811f69544f9aa50f83891edc50ac/

Screenshots (if applicable)

Checklist

General

• PR title is clear and descriptive
• PR description explains the purpose and changes
• Code follows project coding standards
• Self-review of the code has been done
• Changes have been tested locally
• Screenshots have been attached (if applicable)
• Documentation has been updated (if applicable)

Server (if applicable)

• Code is performant and follows best practices
• No security vulnerabilities introduced
• Proper error handling has been implemented
• Added tests for new functionality
• Changes have been tested in different environments (if applicable)

[FelixTJDietrich]

LGTM, thanks for setting up Sentry :)