For darklaunch comparisons where the two sides have different Python
versions, we'll want a more comprehensive list of normalizers.
- Expand the default list to include patterns discovered during a Python
3.8 vs. 3.12 comparison.
- Append the setting value by default, rather than replacing (but still
allow replacing).
- Use default normalizers if custom ones can't be loaded.
- Add log message when loading normalizers fails.
- Validate the replacement pattern, not just the search pattern.
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