lib: fix assert throwing different error messages in ESM and CJS

This PR addresses issue nodejs#50593, which was caused by the design in the ESM loader. The ESM loader was modifying the file path and replacing the 'file' property with the file proto in the stack trace. This, in turn, led to unhandled exceptions when the assert module attempted to open the file to display erroneous code. The changes in this PR resolve this issue by handling the file path correctly, ensuring that the remaining message formatting code can execute as expected.

lib/assert.js

@@ -296,7 +296,7 @@ function getErrMessage(message, fn) {
   overrideStackTrace.set(err, (_, stack) => stack);
   const call = err.stack[0];
 
-  const filename = call.getFileName();
+  let filename = call.getFileName();
   const line = call.getLineNumber() - 1;
   let column = call.getColumnNumber() - 1;
   let identifier;
@@ -330,6 +330,14 @@ function getErrMessage(message, fn) {
         const { StringDecoder } = require('string_decoder');
         decoder = new StringDecoder('utf8');
       }
+
+      // ESM file prop is a file proto. Convert that to path.
+      // This ensure opensync will not throw ENOENT for ESM files.
+      const fileProtoPrefix = 'file://';
+      if (StringPrototypeStartsWith(filename, fileProtoPrefix)) {
+        filename = StringPrototypeReplace(filename, fileProtoPrefix, '');
+      }
+
       fd = openSync(filename, 'r', 0o666);
       // Reset column and message.
       ({ 0: column, 1: message } = getCode(fd, line, column));