[Bug]: When I use IncrementalLauncher, if I set setShouldCompile to false, it will always rebuild

### Describe the bug

When I use IncrementalLauncher, if I set setShouldCompile to false, it will always rebuild and not use cache;

### reason:
When setShouldCompile is false, the class file will not be filled into class-files, resulting in an empty folder

Finally, the class-files folder will be deleted

When analyzed again, the class-files folder doesn't exist, Leading to a constant rebuild

### Source code you are trying to analyze/transform

_No response_

### Source code for your Spoon processing

```Java
FilteringFolder filteringFolder = filteringFolder.addFolder(new FileSystemFolder(projectPath));
List allSpoonFiles = filteringFolder.getAllFiles();
Set allFiles = allSpoonFiles.stream().map(file -> file.toFile()).collect(Collectors.toSet());
IncrementalLauncher incrementalLauncher = new IncrementalLauncher(allFiles, Collections.EMPTY_SET, new File(dataCollector.project.getOutDirStr()));
incrementalLauncher.getEnvironment().setComplianceLevel(11);
incrementalLauncher.getEnvironment().setAutoImports(true);
incrementalLauncher.getEnvironment().setIgnoreDuplicateDeclarations(true);
incrementalLauncher.buildModel();

// This bug occurs only when false is set
incrementalLauncher.getEnvironment().setShouldCompile(false);
incrementalLauncher.saveCache()
```

### Actual output

_No response_

### Expected output

_No response_

### Spoon Version

10.4.0

### JVM Version

11

### What operating system are you using?

windows