Several Labs components cannot be installed due to MainLatest package references

[Arlodotexe]

Background

Reported via the #appcontrol-manager channel in the Windows App Community.

Issue introduced in #618

Problem

In several components across Labs, the Dependencies.props files reference preview versions of the mainline WCT.

This is a problem because these are packages from the MainLatest feed. While this was originally required in order to close this PR, we know that packages in the MainLatest feed don't stick around forever, therefore should have been followed up on.

Since it wasn't, the package version selected was removed during regular cleanup and now causes errors for anyone who installs these packages:

Solution

Update these WCT packages to the latest packages available in the public nuget feed, ideally the most recent preview2 or rc package for 8.2, whichever is newer.

[michael-hawker]

Related #662 - seems like some service or other config change underneath us over the weekend, maybe?

We may be able to remove MainLatest (at least temporarily) when we release 8.2 stable.