Describe the problem

With copier copy commands, it can read _skip_if_exists in copier config yml to skip some files by template owner's intentions.
But with copier update commands, it only see a answered file and doesn't know the files to be needed to skip. It needs to use -s to skip files manually.

Template

Use renovate copier manager can update template https://github.com/serious-scaffold/ss-cmake in the my repo sub folder https://github.com/serious-scaffold/ss-pybind11/tree/master/template automatically. And it seems not possible to specify files to skip in the renovaterc.json. Also, it is not reasonable to specify files for general use. See serious-scaffold/ss-pybind11#73, it still reported conflicts requiring manual resolution and didn't update without conflicts according to _skip_if_exists in copier config file https://github.com/serious-scaffold/ss-cmake/blob/ab17e79610f249422663c0f3c70d5d4a70a0ea15/copier.yml#L18-L23

To Reproduce

Reproduce results in pr:

git clone https://github.com/serious-scaffold/ss-pybind11
git checkout a0a8bb49a4653f0da086f6ebbe7b41f7e223b83b
cd template 
copier update -a .copier-answers.ss-cmake.yml

Logs

vscode ➜ /workspaces/ss-pybind11/template (a0a8bb4) $ copier update -a .copier-answers.ss-cmake.yml
Updating to template version 0.0.7
vscode ➜ /workspaces/ss-pybind11/template (a0a8bb4) $ git status
HEAD detached at a0a8bb4
Unmerged paths:
  (use "git restore --staged <file>..." to unstage)
  (use "git add <file>..." to mark resolution)
        both modified:   CMakeLists.txt.jinja
        both modified:   vcpkg.json.jinja

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   .copier-answers.ss-cmake.yml

no changes added to commit (use "git add" and/or "git commit -a")
vscode ➜ /workspaces/ss-pybind11/template (a0a8bb4) $ cat CMakeLists.txt.jinja | grep updating
<<<<<<< before updating
>>>>>>> after updating

It update successfully with conflicts results.

Expected behavior

It can update template according to _skip_if_exists files in copier config yml or specify files to skip in a answered file.(Prefer to the second solution)

Screenshots/screencasts/logs

No response

Operating system

Linux

Operating system distribution and version

Linux f3e2c9372be8 5.15.133.1-microsoft-standard-WSL2 #1 SMP Thu Oct 5 21:02:42 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

Copier version

copier 9.4.1

Python version

Python 3.10.12

Installation method

pipx+pypi

Additional context

No response