[java][Spring] Add generated annotation for enum converter

[jorgerod]

PR checklist

• Read the contribution guidelines.
• Run the following to build the project and update samples:

  ./mvnw clean package || exit
  ./bin/generate-samples.sh ./bin/configs/*.yaml || exit
  ./bin/utils/export_docs_generators.sh || exit
  

  (For Windows users, please run the script in WSL)
  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
  IMPORTANT: Do NOT purge/delete any folders/files (e.g. tests) when regenerating the samples as manually written tests may be removed.
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

@bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04) @lwlee2608 (2019/10) @martin-mfg (2023/08)

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Summary by cubic

Adds a @Generated annotation to the Java Spring enum converter (EnumConverterConfiguration) to align with other outputs and reduce false positives in static analysis and coverage. Updates JavaSpring/converter.mustache to import {{javaxPackage}}.annotation.Generated and apply {{>generatedAnnotation}} before @Configuration, and regenerates Spring samples to use the correct jakarta/javax import accordingly.

^{Written for commit 41eaf91. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 26 files

_{Re-trigger cubic}

[cubic-dev-ai]

1 issue found across 29 files (changes from recent commits).

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[cubic-dev-ai]

1 issue found across 29 files (changes from recent commits).

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="samples/openapi3/client/petstore/spring-cloud-spring-pageable/src/main/java/org/openapitools/api/PetApi.java">

<violation number="1">
P1: The `spring-cloud-spring-pageable` sample has regressed from Spring `Pageable` integration to explicit query parameters, contradicting the sample's purpose and the PR description.</violation>
</file>

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

Re-trigger cubic</sub>