Remove unused (chore) file, stop checking in pubspec.lock.

[matanlurey]

Just a cleanup.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.11%. Comparing base (613773a) to head (56fbcd9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #12   +/-   ##
=======================================
  Coverage   94.11%   94.11%           
=======================================
  Files          41       41           
  Lines        1766     1766           
=======================================
  Hits         1662     1662           
  Misses        104      104           

Flag	Coverage Δ
jsonut	100.00% <ø> (ø)
lore	100.00% <ø> (ø)
mansion	100.00% <ø> (ø)
oath	100.00% <ø> (ø)
proc	98.69% <ø> (ø)
quirk	82.69% <ø> (ø)
sdk	79.63% <ø> (ø)

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