process: move test-process-uptime to parallel

In addition, do not make too many assumptions about the startup
time and timer latency in test-process-uptime. Instead only test
that the value is likely in the correct unit (seconds) and it should
be increasing in subsequent calls.

PR-URL: #26206
Fixes: #26205
Refs: #26016
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

test/pummel/test-process-uptime.js → test/parallel/test-process-uptime.js

@@ -24,14 +24,14 @@ require('../common');
 const assert = require('assert');
 
 console.error(process.uptime());
-assert.ok(process.uptime() <= 2);
+// Add some wiggle room for different platforms.
+// Verify that the returned value is in seconds -
+// 15 seconds should be a good estimate.
+assert.ok(process.uptime() <= 15);
 
 const original = process.uptime();
 
 setTimeout(function() {
   const uptime = process.uptime();
-  // some wiggle room to account for timer
-  // granularity, processor speed, and scheduling
-  assert.ok(uptime >= original + 2);
-  assert.ok(uptime <= original + 3);
-}, 2000);
+  assert.ok(original < uptime);
+}, 10);