[C++][CI] arrow-compute-plan-test and arrow-compute-hash-join-node-test fails on test-conda-cpp-valgrind

There has been an issue on the last test-conda-cpp-valgrind nightly tests for both:

The following tests FAILED:
	 34 - arrow-compute-plan-test (Failed)
	 35 - arrow-compute-hash-join-node-test (Failed) 

There seems to be a couple of issues. The job run can be seen here:

https://github.com/ursacomputing/crossbow/runs/7332161636

Taking a look on the last introduced commits, I think the commit that introduced the issue is the following one: https://github.com/apache/arrow/commit/96a3af437bfc498b75b832b161df378ad96cae1c