fix(node/systemd): add --max-runtime-instances 🐛

[chainflip-bot]

This is an automated cherry-pick of 8f4011f to release/1.7.
Please review and merge if appropriate.
Original PR: #5431

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71%. Comparing base (97e30d7) to head (b5a9128).
Report is 1 commits behind head on release/1.7.

Additional details and impacted files

@@             Coverage Diff             @@
##           release/1.7   #5432   +/-   ##
===========================================
- Coverage           71%     71%   -0%     
===========================================
  Files              492     492           
  Lines            85842   85842           
  Branches         85842   85842           
===========================================
- Hits             61015   61013    -2     
+ Misses           21996   21995    -1     
- Partials          2831    2834    +3     

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