Fix AST-136023: Route authentication logs to Eclipse Error Log

Replace SLF4J log calls in Authenticator.doAuthentication() with
CxLogger so auth success/failure messages appear in .metadata/.log
and the Eclipse Error Log UI instead of being silently dropped.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: cx-aniket-shinde

checkmarx-ast-eclipse-plugin/src/com/checkmarx/eclipse/runner/Authenticator.java

@@ -33,10 +33,10 @@ public String doAuthentication(String apiKey, String additionalParams) {
 	       try {
 	           CxWrapper wrapper = new CxWrapper(config, log);
 	           String cxValidateOutput = wrapper.authValidate();
-	           log.info(AUTH_STATUS + cxValidateOutput);
+	           CxLogger.info(AUTH_STATUS + cxValidateOutput);
 	           return cxValidateOutput;
 	       } catch (IOException | InterruptedException | CxException e) {
-	           log.error(String.format(PluginConstants.ERROR_AUTHENTICATING_AST, e.getMessage()), e);
+	           CxLogger.error(String.format(PluginConstants.ERROR_AUTHENTICATING_AST, e.getMessage()), e);
 	           return e.getMessage();
 	       }
 	   }