test: Do not fail if valgrind is not available

The command -v check inadvertently exited 0 because it confusingly
also considers functions and aliases. Check if we are able to run
a valgrind binary instead by querying its version.

Then, the msgdebug in the alternative code path was included in the
output that we are asserting so that was causing failures too and
needs removing.

Everything is horrible :D

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