Add config value for skipping "Recent repositories" prompt

[gforien]

• PR Description
  The configuration key notARepository configures the action to be taken when opening Lazygit outside of a git repo.

Current possible values are

• 'prompt': (default) ask whether to initialize a new repo or open in the most recent repo
• 'create': initialize a new repo
• 'skip': open most recent repo
• 'quit': exit Lazygit

With notARepository: skip, the most recent repository is selected, but a "Recent repositories" prompt is still opened.

Proposed change:

• notARepository: recent open most recent repo and the "Recent repositories" prompt
• notARepository: skip open most recent repo and skip the prompt

Related issue: #3129

• Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go generate ./...)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• If a new UserConfig entry was added, make sure it can be hot-reloaded (see here)
• Docs have been updated if necessary
• You've read through your own file changes for silly mistakes etc