test_runner: accept \x1b as a escape symbol

Fixes: https://github.com/nodejs/node/issues/46959
PR-URL: https://github.com/nodejs/node/pull/47050
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

lib/internal/test_runner/tap_lexer.js

@@ -525,7 +525,7 @@ class TapLexer {
   }
 
   #isEscapeSymbol(char) {
-    return char === '\\';
+    return char === '\\' || char === '\x1b';
   }
 
   #isYamlStartSymbol(char) {

test/parallel/test-runner-tap-lexer.js

@@ -480,3 +480,15 @@ ok 1
     assert.strictEqual(tokens[index].value, token.value);
   });
 }
+
+{
+  const tokens = TAPLexer('\x1b');
+
+  [
+    { kind: TokenKind.ESCAPE, value: '\x1b' },
+    { kind: TokenKind.EOL, value: '' },
+  ].forEach((token, index) => {
+    assert.strictEqual(tokens[index].kind, token.kind);
+    assert.strictEqual(tokens[index].value, token.value);
+  });
+}