Project Setting: Add toggle to remove Operations left nav item

Problem to solve

In project settings, there are a number of left sidebar menu items that can be toggled off such as the repository, issues, and snippets; however, there are a number of items that cannot be toggled off which leads to a poor user experience if the project isn't ever going to utilize those features.

Proposal

We should allow users to toggle off the Operations left nav item in Project Settings => General => Visibility, Project Features, and Permissions. Please copy the design for how we allow users to toggle off repositories, issues, and snippets.

A clear summary around expectations can be found further down in this comment

Documentation

We will need to update our documentation on project settings.