[CI][C++] Example build is filing in CUDA job

[kou]

Describe the bug, including details regarding any error messages, version, and platform.

https://github.com/ursacomputing/crossbow/actions/runs/18546583973/job/52865738072#step:6:2433

[ 50%] Building CXX object CMakeFiles/arrow-example.dir/example.cc.o
/arrow/cpp/examples/minimal_build/example.cc:18:10: fatal error: arrow/csv/api.h: No such file or directory
   18 | #include <arrow/csv/api.h>
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.

Example build test was added by #47746. cpp/examples/minimal_build/example.cc uses CSV module but some jobs don't enable CSV.

Component(s)

C++, Continuous Integration

[raulcd]

Issue resolved by pull request 47841
#47841