Add --clean arg to take a list of comma-seperated files to touch

[hugovk]

This PR updates python#105151 to allow Doc/tools/touch-clean-files.py to take a --clean parameter, which is a comma-separated list of files to touch.

This means we can use https://github.com/Ana06/get-changed-files with paths containing spaces.

Demo PR:

• Demo PR for docs CSV list of files with spaces in path hugovk/cpython#50

With added commit with two changed docs files, one with a space in the path:

• hugovk@de2d60e

First action check:

• https://github.com/hugovk/cpython/actions/runs/5141469456/jobs/9253999311?pr=50#step:5:18

Second action check:

• https://github.com/hugovk/cpython/actions/runs/5141469456/jobs/9254006575?pr=50#step:8:22

Second action output is used here, the two files are touched:

Touching:
Doc/about.rst
Doc/tools/touch-clean-files.py
Touched 2 files

• https://github.com/hugovk/cpython/actions/runs/5141469456/jobs/9254006575?pr=50#step:9:16

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📚 Documentation preview 📚: https://cpython-previews--168.org.readthedocs.build/