Patch run() placeholder substitutions to honor configuration defaults

[mih]

This is the companion of datalad/datalad#7509

Closes #478

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c64978b) 92.08% compared to head (5716843) 92.33%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #485      +/-   ##
==========================================
+ Coverage   92.08%   92.33%   +0.25%     
==========================================
  Files         123      125       +2     
  Lines        9109     9526     +417     
  Branches     1011     1025      +14     
==========================================
+ Hits         8388     8796     +408     
- Misses        704      708       +4     
- Partials       17       22       +5     

Files	Coverage Δ
datalad_next/patches/enabled.py	100.00% <ø> (ø)
datalad_next/patches/run.py	100.00% <100.00%> (ø)
datalad_next/patches/tests/test_run.py	98.48% <94.11%> (ø)

... and 3 files with indirect coverage changes

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