Merge pull request #4846 from DataDog/fix-fix-error-handler

Fix expect_in_fork error reporter

Author: ivoanjo

spec/support/synchronization_helpers.rb

@@ -39,7 +39,7 @@ def expect_in_fork(fork_expectations: nil, timeout_seconds: 10)
       stdout ||= File.read(fork_stdout.path)
       stderr ||= File.read(fork_stderr.path)
 
-      raise "Failure or timeout during `expect_in_fork`, STDOUT: `#{stdout}`, STDERR: `#{stderr}`", e
+      raise "Failure or timeout in `expect_in_fork`, STDOUT: `#{stdout}`, STDERR: `#{stderr}`", cause: e
     ensure
       Process.kill('KILL', pid) rescue nil # Prevent zombie processes on failure