Add Dev Home log collecting powershell script

[dkbennett]

Summary of the pull request

Adds a refined log gathering script from the feedback and discussion of PR #2953 . The changes to the script were quite extensive and so it was cleaner to create a new PR.

This script collects all .dhlogs from across the different Microsoft-published DevHome packages and extensions.

References and relevant issues

Detailed description of the pull request / Additional comments

Script was added to tools/scripts folder, and also updated in the Dev Home solution so it can be easily found and updated from there.

Script features:

• Names by timestamp to the second, which is not perfectly unique but should be good enough for any reasonable use and is very human readable.
• Has a "-StopDevHome" parameter to terminate any Dev Home processes running, which can hold the lock on files. Since this is destructive it is not the default.
• Archive is created in the user's temp folder.
• Preserves folder structure of the logs within their respective packages to avoid collisions between different packages with similar log naming.
• Only gets .dhlog files from the specified set of package names, which includes DevHome, GitHub extension, and Azure extension, and their Canary and Dev versions.
• Copies the resulting archive path to the clipboard for easy pasting and prints it to the screen.
   

Validation steps performed

• Tested gathering logs from across multiple packages.
• Verified each of the above features.
• Confirmed resulting archive can be readily opened in Explorer or by an archive-reading tooling.

PR checklist

• Closes #xxx
• Tests added/passed
• Documentation updated

[krschau]

Probably for a different change, but can we add a button inside Dev Home to run this?