OutputConsoleLogger supports not forcing focus onto the Error List

[donnie-msft]

Bug

Fixes:

Description

Draft - for an upcoming Quality Week I want to investigate if I can improve 2 things:

1. When "Clear NuGet Local resources" completes, the Output pane is concluded by calling End() which shows "---finished---" and similar text. Unfortunately, it also explicitly tells the ErrorList to appear, which doesn't make sense. This PR fixes that, but there could be a better re-design of how this all works and that's worth thinking through.

2. I'm not able to reproduce Package Manager Console switches to the Error List window automatically Home#6408 but need to spend more time with a real-world EF6 and EFCore scenario to ensure that. I'm wondering if there's a fix that can help Package Manager Console (PMC) as well.

PR Checklist

• Meaningful title, helpful description and a linked NuGet/Home issue
• Added tests
• Link to an issue or pull request to update docs if this PR changes settings, environment variables, new feature, etc.