build: replace local Simple-ML Jar with remote Safe-DS Jar

[lars-reimann]

Closes #327.

Summary of Changes

• Remove Simple-ML Jar from repository
• Use instead the published Safe-DS Jar from Maven Central

[github-actions]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ CREDENTIALS	secretlint	yes		no	4.3s
✅ GIT	git_diff	yes		no	0.01s
✅ KOTLIN	ktlint	8	0	0	20.11s

See errors details in artifact MegaLinter reports on CI Job page
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff