ref!: Upgrade main node version to v18

[BYK]

Prerequisite for #758.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.21%. Comparing base (2d692f7) to head (db30574).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #793    +/-   ##
========================================
  Coverage   50.21%   50.21%            
========================================
  Files          52       52            
  Lines        3529     3529            
  Branches      880      894    +14     
========================================
  Hits         1772     1772            
+ Misses       1756     1572   -184     
- Partials        1      185   +184     

Flag	Coverage Δ
e2e-tests	85.29% <ø> (ø)
unit-tests	48.80% <ø> (ø)

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[Lms24]

If we drop support for Node < 18.20.6, we can also remove 14 and 16 from the test matrix in the build.yml worflow