remove unused _parse_datasets method from abstract db metastore

[mattseddon]

missed in #634

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.73%. Comparing base (3bd22ad) to head (e0dfc92).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #643      +/-   ##
==========================================
+ Coverage   87.70%   87.73%   +0.03%     
==========================================
  Files         112      112              
  Lines       10672    10667       -5     
  Branches     1437     1435       -2     
==========================================
- Hits         9360     9359       -1     
+ Misses        954      950       -4     
  Partials      358      358              

Flag	Coverage Δ
datachain	87.68% <ø> (+0.03%)	⬆️

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