GitHub Enterprise avatars are not working yet as the URLs require authentication

- prevents writing new empty autolink entries
- cleans up empty autolink arrays

Refs #2037

Adds modal prompt when disconnecting integrations
Adds sign out option to internal integration auth providers
Moves auth provider registration/lifecyle into Container

- adds command palette action

This is an ugly hack, but node-fetch doesn't seem to be able to pass `rejectUnauthorized` through on the request options properly even though we are creating a HTTPS agent with it set

Adds autolink configure command to autolinked issues & prs node

Improves best remote caching

Splits models into its own file

GitLens uses legacy project routes for GitLab:

- `${projectURL}/branches`
- `${projectURL}/tree/${branch}`
- `${projectURL}/commit/${sha}`
- `${projectURL}/compare/${base}${notation}${compare}`
- `${projectURL}/blob/${ref}/${fileName}`

These routes are all deprecated and scheduled for removal. See these references:

- https://docs.gitlab.com/ee/development/routing.html#project-routes
- https://gitlab.com/gitlab-org/gitlab/-/issues/118849
- https://gitlab.com/gitlab-org/gitlab/-/issues/28848

This change replaces them with the following scoped routes:

- `${projectURL}/-/branches`
- `${projectURL}/-/tree/${branch}`
- `${projectURL}/-/commit/${sha}`
- `${projectURL}/-/compare/${base}${notation}${compare}`
- `${projectURL}/-/blob/${ref}/${fileName}`