DM-32408: Derive version from git

[timj]

Requires lsst/lsst_versions#1

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Merging #119 (7d8a84c) into main (94d32e2) will increase coverage by 0.37%.
The diff coverage is 100.00%.

❗ Current head 7d8a84c differs from pull request most recent head 6d2eae3. Consider uploading reports for the commit 6d2eae3 to get more accurate results

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
+ Coverage   91.70%   92.08%   +0.37%     
==========================================
  Files          42       42              
  Lines        2665     2665              
==========================================
+ Hits         2444     2454      +10     
+ Misses        221      211      -10     

Impacted Files	Coverage Δ
tests/test_executables.py	94.44% <100.00%> (+22.22%)	⬆️
python/lsst/utils/tests.py	76.56% <0.00%> (+1.87%)	⬆️

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