remove chain rule removal from constructor generator for syntax rules

[jurgenvinju]

This could have let to very subtle bugs. Chain rules are important for the type system, and they can't be removed. The reason is that chain-rules do not lead to sub-types or substitutability of a tree with/without the chain node. So removing a chain application will break the type system.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47%. Comparing base (5046bef) to head (d7df43c).

Additional details and impacted files

@@           Coverage Diff           @@
##              main   #2535   +/-   ##
=======================================
  Coverage       47%     47%           
- Complexity    6705    6706    +1     
=======================================
  Files          791     791           
  Lines        65239   65239           
  Branches      9769    9769           
=======================================
+ Hits         30916   30919    +3     
+ Misses       31909   31905    -4     
- Partials      2414    2415    +1     

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[jurgenvinju]

a test failed earlier for a random case. I restarted the run.