Add regression tests for already-fixed issues #251 and #277

[joseegman]

Adds regression tests that confirm two previously-reported issues are already resolved on current main (they were fixed indirectly by later refactors; reported against much older versions).

Closes #251
Closes #277

#251 — [OpenApi] API code not generated when a $ref path parameter has no description (reported on 4.8.5)

New end-to-end fixture testNoDescriptionRefParameterGeneration uses the exact spec from the issue (/test/{testId} with a $ref to #/components/parameters/testId, no description, response $ref to #/components/responses/TestResponse). It asserts the API file is generated with the @PathVariable parameter.

#277 — [AsyncAPI] custom validators only generated in one model package when consumer/supplier use different modelPackage

New fixture testCustomValidatorsDifferentPackages configures the consumer and supplier with different modelPackages, both referencing the same schema (data) that has constraints (required, min/max, pattern, size). It asserts the customvalidator folder is generated with the full set of annotation + validator classes in both the consumer and producer packages, and that each DataDTO imports them from its own package.

Validation

• multiapi-engine: full suite green — 133 tests, 0 failures (was 131 before these two cases).
• Version bumped to 6.7.2 in all three modules (engine, Maven plugin, Gradle plugin).

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 4 duplication

Metric	Results
Complexity	0
Duplication	4

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