Speed up runspace and tab initialization (#4793)

* Add startup performance tracing

* Lazy initialize non-default tabs

* Render install app entries incrementally

* Defer and cache toggle status checks

* Clean up runspace invocation ownership

* Defer GUI runspace pool startup

* Defer status taskbar asset rendering

* Record final speed verification

* Fix deferred install render timer callback

* Add dispatcher smoke coverage for install rendering

* Replace install render timer with dispatcher callbacks

* Gate performance tracing behind compile switch

* Clean up analyzer warnings in speed changes

* Speed up runspace and tab initialization

tools/perf/Stop-WinUtilPerformanceTrace.ps1

@@ -0,0 +1,15 @@
+function Stop-WinUtilPerformanceTrace {
+    param(
+        [string]$Name = "Startup trace complete"
+    )
+
+    if (-not (Test-WinUtilPerformanceTrace) -or $null -eq $sync -or -not $sync.ContainsKey("PerformanceTrace")) {
+        return
+    }
+
+    Write-WinUtilPerformanceCheckpoint -Name $Name
+
+    if ($null -ne $sync.PerformanceTrace.Stopwatch) {
+        $sync.PerformanceTrace.Stopwatch.Stop()
+    }
+}