Stop auto-migrating projects

[frostming]

Pull Request Check List

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

[codecov-commenter]

Codecov Report

Merging #912 (801d962) into main (d764c9d) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #912      +/-   ##
==========================================
+ Coverage   84.07%   84.11%   +0.03%     
==========================================
  Files          74       74              
  Lines        6454     6426      -28     
  Branches     1329     1321       -8     
==========================================
- Hits         5426     5405      -21     
+ Misses        710      703       -7     
  Partials      318      318              

Flag	Coverage Δ
unittests	83.87% <100.00%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
pdm/cli/actions.py	79.88% <ø> (+0.40%)	⬆️
pdm/core.py	86.95% <100.00%> (-0.12%)	⬇️

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