Move filter by and sort by views to the bottom and collapse for new users

[mattseddon]

This PR moves the filter by and sort by trees to the bottom of our view container and collapses them for new users. I think we can do this because we have decided these are "advanced features". From the docs:

A view can also have an optional visibility property which can be set to visible, collapsed, or hidden. 
This property is only respected by VS Code the first time a workspace is opened with this view. 
After that, the visibility is set to whatever the user has chosen. 
If you have a view container with many views, or if your view will not be useful to every user of your extension, consider setting the view the collapsed or hidden. 

This will be the screen that a new user sees when they get setup for the first time:

For comparison, Gitlens collapses all of the views it adds to the SCM tree. I only expand them when I use them. E.g:

Screen.Recording.2023-03-09.at.8.57.14.am.mov

[Q] Which other (if any) tree views should get the same treatment?

[codeclimate]

Code Climate has analyzed commit 5f2498f and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (85% is the threshold).

This pull request will bring the total coverage in the repository to 95.7% (0.0% change).

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