Remove Start-EditorServices and put in PSES repo

[rjmholt]

The Start-EditorServices script belongs to PowerShellEditorServices, so should be moved back there. This PR just makes that change.

Adding the script into PSES is tracked in PSES PR #639.

[TylerLeonhardt]

This PR needs to update the code to use the correct path of the Start-EditorServices.ps1.

Right now, Start-EditorServices.ps1 doesn't get published inside of vscode-powershell/modules/PowerShellEditorServices.

We should consider adding it in there so that we can use that path in vscode-powershell. I think this requires modifying the PSES build script to add the Start-EditorServices file to it's module.

[rjmholt]

So the path here needs to be ..\..\modules\PowerShellEditorServices\module\Start-EditorServices.ps1?

[TylerLeonhardt]

That looks right. Keep in mind, we may need to do some work to the build script because as of right now, I don't think that file gets copied over to the path you mentioned and while developing I believe the extension uses the PSES folder that you cloned next to the vscode-powershell folder.

Now I'm starting to realize why David did this in the first place 😅

[rjmholt]

Not sure how I managed to double up on PRs here (I think?). Closing in favour of #1252.