Make gentest-validate more graceful of different file organization (#1672)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1672

`gentest-validate` checks signedsource for generated tests. D58307002 adds a new directory under `java/tests/com/facebook/yoga/`, which [confuses](https://github.com/facebook/yoga/actions/runs/9653979292/job/26627690870) the current directory traversal logic.

This replaces the traversal with `glob`, and makes us skip files without a signature, instead of special-casing the Java directory.

Reviewed By: yungsters

Differential Revision: D58987293

fbshipit-source-id: a5640f5faee4aa40879c266211c5e736a0b077be

package.json

@@ -23,5 +23,8 @@
     "eslint-plugin-prettier": "^4.2.1",
     "prettier": "2.8.8",
     "typescript": "5.0.4"
+  },
+  "resolutions": {
+    "cliui/wrap-ansi": "7.0.0"
   }
 }