refactor: fix __dirname and package.json import issues

[tatomyr]

What/Why/How?

Improved esm/cjs compatibility

Reference

Testing

Screenshots (optional)

Check yourself

• Code changed? - Tested with redoc/reference-docs/workflows (internal)
• All new/updated code is covered with tests
• New package installed? - Tested in different environments (browser/node)

Security

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

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6bbbdfd

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 [ms]	Min [ms]	Max [ms]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	960.0 ± 16.2	940.3	995.3	1.00
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1040.8 ± 11.9	1016.3	1053.5	1.08 ± 0.02