Export InvokePesterStub.ps1 to PowerShellEditorServices

This fixes the path to the script which is now part of the
`PowerShellEditorServices` repository. This was necessary in order to sign it,
as it must be signed _before_ the VSIX is created. Moving it to the other repo
was the best way to solve the "chicken-egg" problem that presented.

Author: andyleejordan

.vsts-ci/templates/release-general.yml

@@ -42,7 +42,6 @@ steps:
     # NOTE: Code AKA *.vsix files are not signed
     pattern: |
       Install-VSCode.ps1
-      InvokePesterStub.ps1
 
 - template: EsrpScan.yml@ComplianceRepo
   parameters:

InvokePesterStub.ps1

@@ -18,7 +18,7 @@ export class PesterTestsFeature implements vscode.Disposable {
     private invokePesterStubScriptPath: string;
 
     constructor(private sessionManager: SessionManager) {
-        this.invokePesterStubScriptPath = path.resolve(__dirname, "../../../InvokePesterStub.ps1");
+        this.invokePesterStubScriptPath = path.resolve(__dirname, "../../../modules/PowerShellEditorServices/InvokePesterStub.ps1");
 
         // File context-menu command - Run Pester Tests
         this.command = vscode.commands.registerCommand(