chore: fix test links and add coverage report

[tatomyr]

What/Why/How?

• Fixed wrong links to the repo files after the previous refactoring
• Improved the getCommandOutput utility function interface to be easier to use
• Renamed a file mjs -> js
• Added test coverage report

Reference

A follow-up of #2390

Check yourself

• Code changed? - Tested with Redoc/Realm/Reunite (internal)
• All new/updated code is covered by tests
• New package installed? - Tested in different environments (browser/node)
• Documentation update considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

⚠️ No Changeset found

Latest commit: 62a76d5

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint resources/rebilly.yaml	1.431 ± 0.025	1.405	1.472	1.00
redocly-next lint resources/rebilly.yaml	1.447 ± 0.027	1.407	1.507	1.01 ± 0.03

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🟢	Lines	78.77% (🎯 78%)	5805 / 7369
🟢	Statements	78.21% (🎯 78%)	6000 / 7671
🟢	Functions	81.93% (🎯 81%)	1197 / 1461
🟢	Branches	70.95% (🎯 70%)	4013 / 5656

File Coverage

No changed files found.

Generated in workflow #7870 for commit 62a76d5 by the Vitest Coverage Report Action