Move all the Pester based tests into their related task folder

[rfennell]

As part of a revision of the CI/CD process I want to move all the current Pester tests for Powershell based tasks into the relevant Task folder. See the WIki for details of the revised structure.

The main reason for this is to allow easier running of tests sets for each separate Extension within the CI/CD pipeline, and to reflect the layout of the Typescript based tasks.

The three extensions that require this refactoring are

• Pester
• StyleCop
• VersionDacpacTask

As well as moving the file the src entries need to be added to the files and contributions blocks of the vss-extension.json file e.g.

 "files": [
     {
         "path": "StyleCopTask/src"
    }
  ],
  "contributions": [
      {
        "id": "Stylecop-Runner",
        "type": "ms.vss-distributed-task.task",
        "targets": [
             "ms.vss-distributed-task.tasks"
           ],
         "properties": {
             "name": "StyleCopTask/src"
           }
     }
  ]

It is planned this work will only be done as other fixes/enhancements are made to these extensions

[rfennell]

StyleCop in progress as part of PR #171
Pester in progress as #204

[rfennell]

DacPac versions tests moved

[rfennell]

All now completed