fix(nodebuilder): Use test node for tests instead of New

[renaynay]

Fixes issue with this test not using in-memory keyring.

[codecov-commenter]

Codecov Report

Merging #1350 (d442b82) into main (90bd741) will decrease coverage by 0.49%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1350      +/-   ##
==========================================
- Coverage   55.33%   54.83%   -0.50%     
==========================================
  Files         178      178              
  Lines       10692    10692              
==========================================
- Hits         5916     5863      -53     
- Misses       4193     4250      +57     
+ Partials      583      579       -4     

Impacted Files	Coverage Δ
nodebuilder/state/keyring.go	0.00% <0.00%> (-56.87%)	⬇️
libs/keystore/map_keystore.go	80.95% <0.00%> (-4.77%)	⬇️
share/eds/byzantine/bad_encoding.go	65.00% <0.00%> (-3.00%)	⬇️
share/eds/byzantine/pb/share.pb.go	32.88% <0.00%> (-1.97%)	⬇️
share/ipld/get.go	91.24% <0.00%> (-1.39%)	⬇️

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[Wondertan]

Thanks. Good catch.