Tests: also record `pwd`

... as test meta data. Tests are executed in an unspecified directory,
assuming pass or fail is independent of the location where the test
is run. While this generally is true, test logs often contain the
working directory. So, in order to more easily compare different
execution orders of a potential race condition, it can be desirable
to compare logs "up to the execution directory". This, however,
requires that this directory is recored in the first place. Do so.

For consistency of the output format, also have a (fixed) artifact
pwd in the summary report.

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