enable cprover regression tests

[kroening]

This commit enables the tests in regression/cprover/

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• 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).
• My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Base: 77.82% // Head: 77.86% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (09e78b5) compared to base (2a08d59).
Patch has no changes to coverable lines.

❗ Current head 09e78b5 differs from pull request most recent head d6dbb06. Consider uploading reports for the commit d6dbb06 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7180      +/-   ##
===========================================
+ Coverage    77.82%   77.86%   +0.04%     
===========================================
  Files         1578     1616      +38     
  Lines       182242   186689    +4447     
===========================================
+ Hits        141824   145366    +3542     
- Misses       40418    41323     +905     

Impacted Files	Coverage Δ
src/solvers/smt2/smt2_conv.h	84.61% <0.00%> (-15.39%)	⬇️
src/goto-programs/goto_program.h	90.19% <0.00%> (-0.51%)	⬇️
src/cprover/free_symbols.cpp	75.00% <0.00%> (ø)
src/cprover/endianness_map_wide.cpp	0.00% <0.00%> (ø)
src/cprover/report_properties.cpp	88.46% <0.00%> (ø)
src/cprover/console.cpp	32.46% <0.00%> (ø)
src/cprover/endianness_map_wide.h	0.00% <0.00%> (ø)
src/cprover/wcwidth.c	0.00% <0.00%> (ø)
src/cprover/cprover_main.cpp	100.00% <0.00%> (ø)
src/cprover/format_hooks.cpp	49.42% <0.00%> (ø)
... and 37 more

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