fix(core): add support for finding electron for npm 7 workspaces

[malept]

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• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:

Fixes #2306.

Also does a refactor of the electron version tests for clarity and scoping of test variables. They were kind of in a weird state since we do not run the testsuite for each NODE_INSTALLER anymore.

[codecov]

Codecov Report

Merging #2446 (9104e3d) into master (677cf9d) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2446      +/-   ##
==========================================
+ Coverage   75.29%   75.35%   +0.05%     
==========================================
  Files          91       91              
  Lines        2352     2353       +1     
  Branches      441      440       -1     
==========================================
+ Hits         1771     1773       +2     
  Misses        472      472              
+ Partials      109      108       -1     

Impacted Files	Coverage Δ
packages/api/core/src/util/electron-version.ts	90.62% <100.00%> (+1.73%)	⬆️

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