Add acceptance tests for Swagger/OpenAPI using Playwright

[google-labs-jules]

This change introduces acceptance tests for the Swagger/OpenAPI interface using Playwright for Java.

Changes:

• Added playwright dependency to src/refimpl-tests/pom.xml.
• Created src/refimpl-tests/src/test/groovy/SwaggerSpec.groovy.
  • Uses Testcontainers to spin up the environment (reuse existing docker-compose.yml).
  • Initializes Playwright to interact with the browser.
  • Verifies that the Swagger UI loads successfully for server-rm, server-cm, server-qm, and server-am.

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PR created automatically by Jules for task 17838979266940075338 started by @berezovskyi

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