Bugfix: Update-PSResource should not re-install dependency packages which already satisfy dependency criteria

[anamnavi]

Update-PSResource currently re-installs dependency packages even if they already satisfy depdendency criteria. For example, when installing Az.Network if dependency package Az.Accounts is already installed, the code would re-install Az.Accounts:

With this fix, Update-PSResource first collects a list of all installed packages, and then when considering a package's dependency packages it checks against that list of already installed packages.

PR Summary

PR Context

Fixes #1878

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[anamnavi]

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