move goto_check_ct to ansi-c/

[kroening]

The checks done in goto_check_ct are specific to C/C++, and thus belong into
the ansi-c/ directory.

This also moves goto_check to goto-programs/, which right now is merely a
wrapper around goto_check_ct.

• 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.
• 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.

[tautschnig]

An observation while working on the follow-up commit to this: The following flags, in my opinion, should not be handled by goto_check_ct in the first place:

enable_assert_to_assume = _options.get_bool_option("assert-to-assume");
enable_assertions = _options.get_bool_option("assertions");
enable_built_in_assertions =
    _options.get_bool_option("built-in-assertions");
enable_assumptions = _options.get_bool_option("assumptions");

There is nothing C/C++ specific to these.

[codecov]

Codecov Report

Merging #6658 (d3301c0) into develop (1154f13) will decrease coverage by 0.13%.
The diff coverage is 85.22%.

@@             Coverage Diff             @@
##           develop    #6658      +/-   ##
===========================================
- Coverage    76.92%   76.79%   -0.14%     
===========================================
  Files         1583     1589       +6     
  Lines       183314   183483     +169     
===========================================
- Hits        141018   140898     -120     
- Misses       42296    42585     +289     

Impacted Files	Coverage Δ
jbmc/src/java_bytecode/lazy_goto_model.h	100.00% <ø> (+7.40%)	⬆️
jbmc/src/jdiff/jdiff_parse_options.h	100.00% <ø> (ø)
src/analyses/invariant_set.cpp	0.00% <0.00%> (ø)
src/cpp/cpp_typecheck_conversions.cpp	85.14% <0.00%> (+0.10%)	⬆️
src/goto-diff/goto_diff_parse_options.h	100.00% <ø> (ø)
src/goto-instrument/dump_c.cpp	80.49% <0.00%> (+0.28%)	⬆️
src/goto-instrument/dump_c_class.h	100.00% <ø> (ø)
...rc/goto-instrument/goto_instrument_parse_options.h	100.00% <ø> (ø)
src/goto-instrument/goto_program2code.cpp	68.84% <0.00%> (+0.06%)	⬆️
src/goto-programs/string_abstraction.cpp	92.45% <ø> (-0.01%)	⬇️
... and 60 more

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