refactor: Rename `noRepository` state to `openRepositoryCount`

Anatoli Babeniarequested to merge
abitrolly/gitlab-vscode-extension:authless into main

To enable actions without authentication in #637.

The intention is to use in package.json conditions like (gitlab:openRepositoryCount > 0) && editorIsOpen and avoid double negation like !noRepositories && editorIsOpen.

Edited by Anatoli Babenia

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