Avoid blank lines in jaxrs-spec quarkus templates

[wing328]

a follow up PR to #23673

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• Run the following to build the project and update samples:

  ./mvnw clean package || exit
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Summary by cubic

Remove extra blank lines in generated JAX-RS Quarkus sources by tightening Mustache conditionals. This cleans up import blocks and @ResponseStatus usage without changing behavior.

• Bug Fixes
  • Updated api.mustache and apiInterface.mustache in the JAX-RS Quarkus library to avoid emitting blank lines when optional imports/annotations (e.g., org.jboss.resteasy.reactive.RestResponse, org.jboss.resteasy.reactive.ResponseStatus) are not used.
  • Regenerated samples to remove stray blank lines in generated API classes.

^{Written for commit ef578c8. Summary will update on new commits.}

[cubic-dev-ai]

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