fix: handle $ref in the joining path parameters

[IgorKarpiuk]

What/Why/How?

Handle $ref in the joining path parameters

Reference

Closes: #1018

Testing

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• Tested with redoc/reference-docs/workflows
• All new/updated code is covered with tests

Security

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

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	73.76%	3437/4660
🟡	Branches	64.85%	1959/3021
🟡	Functions	66.17%	579/875
🟡	Lines	73.78%	3196/4332

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟡	... / join.ts	59.2%	41.9% (-1.71% 🔻)	58.82%	60.45%

Test suite run success

566 tests passing in 85 suites.

Report generated by 🧪jest coverage report action from 444ce57