[PR] ci: reject duplicate x-descriptors in the Kamelet validator [camel-kamelets]

["oscerd (via GitHub)" <gi...@apache.org>]

oscerd opened a new pull request, #2900:
URL: https://github.com/apache/camel-kamelets/pull/2900

   ## Summary
   
   Adds a regression-guard rule to `script/validator`: a property may not list the same `x-descriptor` more than once.
   
   This closes the loop on #2882 — that fix removed a duplicate `urn:camel:group:credentials` that was introduced when the deprecated `urn:alm:descriptor:com.tectonic.ui:password` descriptor was *converted* (rather than removed) on properties that already carried the canonical descriptor. The validator did not catch it (thanks @apupier for spotting it in review). This rule makes that class of mistake fail fast.
   
   ## Verification
   - `go vet` / `gofmt`: clean.
   - Validator exits `0` on the current catalog (no duplicate descriptors exist after #2882).
   - Verified to **fire** on an injected duplicate:
     `ERROR: property "authUsername" in kamelet "http-secured-sink" lists the x-descriptor "urn:camel:group:credentials" more than once`.
   
   ---
   _AI-generated by Claude Code on behalf of Andrea Cosentino (@oscerd)._
   


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