Add opengraphs to clear simulations cache script

src/scripts/clear_simulations_cache.ts

@@ -33,3 +33,11 @@ if (fs.pathExistsSync(testCasesDir)) {
     fs.removeSync(testCasesDir)
   }
 }
+
+// Remove every test case opengraph image from cache.
+const testCasesOpengraphsDir = path.join(simulationsTestCasesDir, "opengraphs")
+if (fs.pathExistsSync(testCasesOpengraphsDir)) {
+  if (fs.lstatSync(testCasesOpengraphsDir).isDirectory()) {
+    fs.removeSync(testCasesOpengraphsDir)
+  }
+}