Allow copying from scmsync

[hramrach]

Fixes: ade0426 ("Support copying from an scmsync source, when target exists.")

The 'when target exists' restriction is superfluous.

Copying was never about tracking the source, SCM or otherwise.

[adrianschroeter]

point is that you need to decide if you want to use git in the target or not:

1. If you want keep git, the code would need to setup the scmsync, maybe with a concrete commit hash when you the user does not want to follow.
2. If you don't want to keep git, the extra tracking files should be removed instead. Blindly copying content creates a very misleading content otherwise.

[hramrach]

What are the 'extra tracking files' here?

Why would it not be a problem if the package already exists but would be a problem when it's a new package?

[hramrach]

ping?

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 33.94%. Comparing base (fb9ba30) to head (df87e63).
⚠️ Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
osc/core.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2081      +/-   ##
==========================================
+ Coverage   33.90%   33.94%   +0.04%     
==========================================
  Files         196      199       +3     
  Lines       26988    27020      +32     
==========================================
+ Hits         9151     9173      +22     
- Misses      17837    17847      +10     

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