test_runner: expose lcov reporter as newable function

This commit exposes the lcov reporter as a newable function, so that it
can be used in the same way as the other reporters.
This will allow passing in the options to the reporter as well.
This breaks the current behavior of the lcov reporter, which exposes an
instance of the reporter.

Fixes: nodejs#52385
Ref: nodejs#49184

lib/test/reporters.js

@@ -50,7 +50,7 @@ ObjectDefineProperties(module.exports, {
     __proto__: null,
     configurable: true,
     enumerable: true,
-    get() {
+    value: function value() {
       lcov ??= require('internal/test_runner/reporter/lcov');
       return ReflectConstruct(lcov, arguments);
     },