ci(test): use some instead of filter with length

Co-authored-by: Simen Bekkhus <[email protected]>

genMatrix.js

@@ -10,7 +10,7 @@ const testFiles = [
 const nodeDirRegex = /^\d+$/;
 
 const areTestFilesChanged = (changedFiles) => changedFiles
-  .filter((file) => testFiles.includes(file)).length;
+  .some((file) => testFiles.includes(file));
 
 // Returns a list of the child directories in the given path
 const getChildDirectories = (parent) => fs.readdirSync(parent, { withFileTypes: true })