test_runner: remove redundant report call

This commit removes a redundant call to `reportStarted()`. It is
redundant because a few lines down, `subtest.finalize()` is
called. `finalize()` will find the first test that is ready to
report its data, and then call `report()`, which also calls
`reportStarted()`. This will trigger the `'test:start'` as high
up the test tree as necessary.

PR-URL: #52089
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Raz Luvaton <rluvaton@gmail.com>

lib/internal/test_runner/test.js

@@ -469,10 +469,6 @@ class Test extends AsyncResource {
         return;
       }
 
-      if (i === 1 && this.parent !== null) {
-        this.reportStarted();
-      }
-
       // Report the subtest's results and remove it from the ready map.
       subtest.finalize();
       this.readySubtests.delete(i);