Extract rewrite specific bits into commons-rewrite

eclipse-language-servers/org.springframework.tooling.boot.ls/src/org/springframework/tooling/boot/ls/commands/UpgradeToBoot3Handler.java

@@ -59,6 +59,7 @@ public class UpgradeToBoot3Handler extends AbstractHandler {
 							.toArray(CompletableFuture[]::new));
 				} catch (Exception e) {
 					Log.log(e);
+					throw new ExecutionException("Failed to perform Upgarde to Spring Boot 3", e);
 				}
 			}