use --stdcmalloc for tests to catch issues

Closed Nicholas Styles requested to merge nstyles/athena:21.9-useStdcmallocForTests into 21.9

When debugging some recent memory issues, it was noticed that some problems were seen when running with stdcmalloc which were not observed with tcmalloc.

Changing developer/CI test to use stdcmalloc to catch any additional issues that tcmalloc might sweep under the carpet.

cc @asalzbur

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