Migrate validation to Pester (#1249)

* remove Validate-* scripts

* Remove references to validation scripts from .json files

* Separate "It"s by new lines

* Remove new line before the first  "It"

* Separate "It"s by new lines

* remove 32-bit WinAppDriver check

* remove explicit variable definition

Co-authored-by: Sergey Dolin <v-sedoli@micorosoft.com>

images/win/scripts/Tests/Tools.Tests.ps1

@@ -245,4 +245,48 @@ Describe "ServiceFabricSDK" {
     It "PowerShell Module" {
         Get-Module -Name ServiceFabric -ListAvailable | Should -Not -BeNullOrEmpty
     }
-}
+}
+
+Describe "Svn" {
+    It "svn" {
+        "svn --version --quiet" | Should -ReturnZeroExitCode
+    }
+}
+
+Describe "Stack" {
+    It "Stack" {
+        "stack --version" | Should -ReturnZeroExitCode
+    }
+}
+
+Describe "Typescript" {
+    It "tsc" {
+        "tsc --version" | Should -ReturnZeroExitCode
+    }
+}
+
+Describe "Vcpkg" {
+    It "vcpkg" {
+      "vcpkg version" | Should -ReturnZeroExitCode
+    }
+
+    It "env variable VCPKG_INSTALLATION_ROOT is set" {
+      $env:VCPKG_INSTALLATION_ROOT | Should -Not -BeNullOrEmpty
+    }
+
+    It "VCPKG_INSTALLATION_ROOT directory" {
+        $env:VCPKG_INSTALLATION_ROOT | Should -Exist
+    }
+}
+
+Describe "VSWhere" {
+    It "vswhere" {
+        "vswhere" | Should -ReturnZeroExitCode
+    }
+}
+
+Describe "Zstd" {
+    It "zstd" {
+        "zstd -V" | Should -ReturnZeroExitCode
+    }
+}