Remove unused workflow calls

In the first iteration of the release process the release action would
run the tests before making a release. This necessitated adding the
`workflow_call` trigger to every test action.

In practice, this made releases less reliable and made it more difficult
to rerun failed releases. We've long since stopped making the release
action depend on passing tests, but the trigger was copied and pasted
into nearly every project.

Author: mpkorstanje

.github/workflows/build.yml

@@ -1,7 +1,6 @@
 name: Cucumber Scala CI
 
 on:
-  workflow_call:
   pull_request:
     branches:
       - main