[Bug]: generating a complete changelog should overwrite existing file and not commit any changes

[ga-paul-t]

What happened?

The uplift changelog --all command is designed to generate a complete changelog based on the current history of the repository. This is incredibly useful if migrating an existing repository to use Uplift. However, its current design doesn't quite work, as it will only generate a CHANGELOG.md:

1. If there is no existing file. This requires a deletion that ultimately prevents the command from executing due to a dirty repository state
2. It generates a commit which may not include a version number and can produce a confusing git history

This command should be treated as a utility function that updates the existing CHANGELOG.md in situ and requires the user to handle the modified file manually

Steps to reproduce it

1. Clone an existing repository with a CHANGELOG.md file and run uplift changelog --all

Your uplift configuration

No response

Which version?

v2.17.0

Which operating system(s) are you using?

All

Optional debug output

No response

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