Fix citationmatching test failing due to missing sparkExecutorOverhead param

[marekhorst]

In #1427 (this commit: https://github.com/openaire/iis/commit/1bd58dfd0981e149e99dbe0fb2752f9f6c045a68) we have introduced sparkExecutorOverhead parameter, without a default value, but we did not set this parameter in direct citation matching tests.

We need to add this value explicitly in every failing test.