add UserActions for bulk UserUpdateNodesAttrs

[TeunHuijben]

The group actions make heavy use of the UserUpdateNodeAttr actions. They loop over all nodes and apply the update user actions one-by-one, including the expensive tracks.refresh.

This PR makes a "bulk" version of this UserAction, to make that process faster.

(I needed this for the v2-branch, but as the functions are near-idential to main, might just as well change it on main, and pull into v2 😅)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.12%. Comparing base (1738545) to head (1d5ee61).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
+ Coverage   91.07%   91.12%   +0.05%     
==========================================
  Files          59       60       +1     
  Lines        2923     2942      +19     
==========================================
+ Hits         2662     2681      +19     
  Misses        261      261              

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