Update PerfTests to use the latest version

And bump the time for tests that are failing on the virtualized nightly perf runs

gruntfile.js

@@ -126,7 +126,7 @@ module.exports = function (grunt) {
     // const perfTestVersions = ["2.0.0","2.0.1","2.1.0","2.2.0","2.2.1","2.2.2","2.3.0","2.3.1",
     // "2.4.1","2.4.3","2.4.4","2.5.2","2.5.3","2.5.4","2.5.5","2.5.6","2.5.7","2.5.8","2.5.9","2.5.10","2.5.11",
     // "2.6.0","2.6.1","2.6.2","2.6.3","2.6.4","2.6.5","2.7.0"];
-    const perfTestVersions=["2.8.1"];
+    const perfTestVersions=["2.8.8"];
 
     function buildConfig(modules) {
         var buildCmds = {

shared/AppInsightsCore/Tests/Perf/src/CorePerfCheck.Tests.ts

@@ -72,7 +72,7 @@ export class CorePerfCheckTests extends AITestClass {
                     if (isPlainObject(testObject)) {
                         checks++;
                     }
-                }, 50, iterations, 0.00001);
+                }, 65, iterations, 0.00001);
 
                 Assert.equal(iterations * duration.attempts, checks, "Make sure we hit all of them");
             }