Rollup merge of #136630 - jieyouxu:render_tests, r=ChrisDenton

Change two std process tests to not output to std{out,err}, and fix test suite stat reset in bootstrap CI test rendering

I don't really know how to test if this unbreaks CI (since #136607 reported that this breaks the CI test rendering *sometimes*).

Fixes #136607.

r? `@ChrisDenton` (two Windows process tests, but feel free to reroll)

src/bootstrap/src/utils/render_tests.rs

@@ -310,6 +310,9 @@ impl<'a> Renderer<'a> {
         match message {
             Message::Suite(SuiteMessage::Started { test_count }) => {
                 println!("\nrunning {test_count} tests");
+                self.benches = vec![];
+                self.failures = vec![];
+                self.ignored_tests = 0;
                 self.executed_tests = 0;
                 self.terse_tests_in_line = 0;
                 self.tests_count = Some(test_count);