fix: resolve symlinks for startup and git

[smitropoulos]

• PR Description Resolve symlinks when starting lazygit in a symlinked dir under git
• Please check if the PR fulfills these requirements

• [X] Cheatsheets are up-to-date (run go generate ./...)
• [X] Code has been formatted (see here)
• [X] Tests have been added/updated (see here for the integration test guide)
• [X] Text is internationalised (see here)
• [X] Docs (specifically docs/Config.md) have been updated if necessary
• [X] You've read through your own file changes for silly mistakes etc

[jesseduffield]

Thanks for making this. I'm pretty confident this is PR is no longer required now that we've merged https://github.com/jesseduffield/lazygit/pull/3183. Could you confirm whether the original issue you had is still present on master?