chore(developer): remove compile.pas and CompileErrorCodes.pas

Fixes #9923.

These are no longer used because we now use kmc for builds. This also
means that the kmcomp-x64-structures test is no longer required, because
that was used to keep the Delphi and C++ structures in sync.

There are some minor details around error message identifiers that are
still present in a handful of places, but they are work for another
time.