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* GH-3664: Re-enable JavaScript support via GraalVM Fixes https://github.com/spring-projects/spring-integration/issues/3664 The JavaScript JSR223 engine has been removed from Java. Migrate JavaScript support into GraalVM Polyglot API: * Implement `PolyglotScriptExecutor` which can also support other GraalVM languages * Change the `ScriptExecutorFactory` to use a `PolyglotScriptExecutor` when it encounters JavaScript * Re-enable tests for JavaScript * Add GraalVM Polyglot support into docs * * Reinstate `@EnabledIfSystemProperty` for GraalVM JS system property