Detecting configuration files

[dhoehna]

Summary of the pull request

DevHome will now detect a configuration file in a repos .configuration folder. If one is found, the file name, along with the repo name, will be shown in the summary screen along with two options.

1. View the file
2. Run the file

Running the file opens up an admin CMD with "winget [filename]"

This PR includes the ability for other tasks to add their own custom next steps that will show in the summary screen.

References and relevant issues

This PR also moves LoadingMessageViewModel into the service collection.

Detailed description of the pull request / Additional comments

Validation steps performed

Manually ran the scenarios including making a devdrive and cloning.

PR checklist

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

Movies!

All repos downloaded have a config file + view file and run file

Some config files found. One repo encountered an error

Pictures!
More repos cloned than config files found

Loading screen errors and no config files found.

[jsidewhite]