test: improve tests for formatter and grammar

[lars-reimann]

Summary of Changes

• Add tests for the idempotence of formatter
• Clear documents between tests to avoid colliding URIs
• Move test creation code to a separate file, so it can be tested
• Bump dependencies
• Various bug fixes

[codecov]

Codecov Report

Merging #544 (b003b6b) into main (9662469) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #544   +/-   ##
=======================================
  Coverage   99.56%   99.56%           
=======================================
  Files           7        7           
  Lines        1149     1149           
  Branches      238      238           
=======================================
  Hits         1144     1144           
  Misses          5        5           

Components	Coverage Δ
dsl	99.55% <100.00%> (ø)
runner	100.00% <ø> (ø)

Files Changed	Coverage Δ
...rc/language-server/formatting/safe-ds-formatter.ts	99.78% <100.00%> (ø)

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ JSON	eslint-plugin-jsonc	2	0	0	1.23s
✅ JSON	jsonlint	2		0	0.17s
✅ JSON	npm-package-json-lint	yes		no	0.51s
✅ JSON	prettier	2	0	0	0.7s
✅ JSON	v8r	2		0	3.75s
✅ REPOSITORY	git_diff	yes		no	0.04s
✅ TYPESCRIPT	eslint	12	0	0	5.54s
✅ TYPESCRIPT	prettier	12	0	0	1.81s

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[lars-reimann]

🎉 This PR is included in version 0.2.0 🎉

The release is available on:

• Visual Studio Marketplace
• GitHub release

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