Changes default behaviour to ignore archived and deleted repos

[hbontempo-br]

Description

Changes default behavior of ReposModel to deleted and archived repos.
This repos are going to remain on database but should be ignored everywhere in the application

Related Issue

Related to #1704
Should deal with #1735 / #1545

Motivation and Context

Should prevent "bad" repos to be presented to users

How Has This Been Tested?

Automated tests + rubocop analysis (locally)

Screenshots (if appropriate):

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[schneems]

Please change out default_scope for something else.

[hbontempo-br]

PR ended up being bigger than originally expected.
Could break up into smaller ones if you prefer.

[schneems]

Thanks for working on this. Sorry for the EXTREME delay. Looks great. I corrected a merge conflict. re-running tests now.