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/Start-WinUtilPerformanceTrace.ps1

@@ -0,0 +1,14 @@
+function Start-WinUtilPerformanceTrace {
+    if (-not (Test-WinUtilPerformanceTrace) -or $null -eq $sync) {
+        return
+    }
+
+    if (-not $sync.ContainsKey("PerformanceTrace")) {
+        $sync.PerformanceTrace = @{
+            Stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
+            LastElapsedMs = 0.0
+        }
+    }
+
+    Write-WinUtilPerformanceCheckpoint -Name "Startup trace started"
+}