fix: validate types in spec rule

[IgorKarpiuk]

What/Why/How?

Validate types list in spec rule

Reference

closes https://github.com/Redocly/redocly-cli/issues/856

Testing

Screenshots (optional)

Check yourself

• [x] Code is linted
• [ ] Tested with redoc/reference-docs/workflows
• [x] All new/updated code is covered with tests

Security

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

[github-actions[bot]]

Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟡	Statements	73.18%	3271/4470
🟡	Branches	64.89%	1835/2828
🟡	Functions	65.59%	547/834
🟡	Lines	73.08%	3038/4157

Show files with reduced coverage 🔻

St.:grey_question:	File	Statements	Branches	Functions	Lines
🟢	... / utils.ts	93.85% (-1.07% 🔻)	91.18% (-2.16% 🔻)	91.67% (+1.67% 🔼)	95.08% (-1.28% 🔻)

Test suite run success

508 tests passing in 85 suites.

Report generated by 🧪jest coverage report action from 2d2e324a524e77e523164828f86c7ae1f4f948cb