test.pl now reports both directory and descriptor file name

[kroening]

The test.pl script identifies tests by the directory and the name of the descriptor file name. Historically, the directory was sufficient, since the descriptor file name used to be hardwired to test.desc. This changes the output to include both the path and the name of the file, which removes the need to look for directory and file name in two different places.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.64%. Comparing base (e8ff03a) to head (8d2081a).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8252   +/-   ##
========================================
  Coverage    79.64%   79.64%           
========================================
  Files         1684     1684           
  Lines       195684   195684           
========================================
  Hits        155852   155852           
  Misses       39832    39832           

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