goto_check_ct::add_guarded_property now has is_fatal parameter

[kroening]

This enables designating further assertions as fatal.

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• n/a 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).
• 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

Attention: Patch coverage is 4.54545% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 78.25%. Comparing base (c320360) to head (5c5895b).

Files	Patch %	Lines
src/ansi-c/goto-conversion/goto_check_c.cpp	4.54%	21 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8297      +/-   ##
===========================================
- Coverage    78.35%   78.25%   -0.10%     
===========================================
  Files         1721     1721              
  Lines       188278   188510     +232     
  Branches     18460    18455       -5     
===========================================
  Hits        147523   147523              
- Misses       40755    40987     +232     

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