Test against everything from CRuby

It doesn't take that much longer.
If a change in prism breaks CRuby tests,
the PR should be made in ruby/ruby instead.

Author: Earlopain

.github/workflows/cruby-bindings.yml

@@ -43,5 +43,5 @@ jobs:
           make -j2
         working-directory: ruby/ruby
       - name: make test-all
-        run: make -j2 -s test-all TESTS="prism ruby/test_syntax.rb ruby/test_compile_prism.rb --no-retry"
+        run: make -j2 -s test-all
         working-directory: ruby/ruby