"Run File" should be before "Debug File"

[isidorn]

Testing #129384

Run File should be before Debug File.
I am not sure if this is controlled by core, but Run File should be first because:

• I believe that most users actually use the Run more in the title bar. We can dig out some numbers
• We call the view "Run and Debug" since Run is "lighter", so it should also go first here
• The hover title of the chevron is "Run or Debug"

[isidorn]

Now I saw that this comes from Mock Debug. Though I still think we should fix mock debug so it is a good example for other debug extensions.

[weinand]

I've created microsoft/vscode-mock-debug#58 for this.