build: add build-ffi-tests as a requesite of test-ci-js

[aduh95]

Without it, I'm getting Missing FFI test fixture library when running test-js-ci on 26.1.0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.04%. Comparing base (b5da751) to head (24244b5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #63165   +/-   ##
=======================================
  Coverage   90.03%   90.04%           
=======================================
  Files         713      713           
  Lines      224510   224510           
  Branches    42438    42442    +4     
=======================================
+ Hits       202148   202153    +5     
+ Misses      14163    14160    -3     
+ Partials     8199     8197    -2     

see 27 files with indirect coverage changes

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[richardlau]

This is a fly by comment as I'm not at a computer at the moment to investigate in detail, but this does not feel correct. By definition test-ci-js should not require a native compiler -- those tests should be in test-ci-native. I can see a few lines above have test/ffi/.buildstamp as a requisite for test-ci-native, so my assumption would be that the ffi testsuite has been misclassified into CI_JS_SUITES instead of CI_NATIVE_SUITES.