Add new launch.json task for better ad-hoc end and interactive end to end building and testing

[bergmeister]

PR Summary

This helps speed up the inner loop when iterating and testing certain scenarios work end to end interactively.
The task builds PSSA and imports it in a new temp shell so that after the task one can copy paste desired end to end example into the shell for interactive end to end testing.

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.