Coverage tests are broken

[c-dilks]

The error seems to come from TestMultithreading.h, specifically when the AlgorithmSequence is created or started, but it's not so clear. Perhaps we can disable coverage testing for this header (I tried with GCOVR_EXCL_* comments, but that was unsuccessful).

Error report

FAILED: meson-internal__coverage-html 
/usr/sbin/meson --internal coverage --html /__w/iguana/iguana/iguana_src /__w/iguana/iguana/iguana_src/subprojects /__w/iguana/iguana/iguana_build /__w/iguana/iguana/iguana_build/meson-logs --gcov gcovr --llvm-cov llvm-cov
LLVM (http://llvm.org/):
  LLVM version 18.1.8
  Optimized build.
(INFO) Reading coverage data...
(WARNING) Unrecognized GCOV output for /__w/iguana/iguana/iguana_src/src/iguana/services/YAMLReader.cc
	  branch  1 taken -1
	  branch  1 taken -1
	This is indicative of a gcov output parse error.
	Please report this to the gcovr developers
	at <https://github.com/gcovr/gcovr/issues>.
(WARNING) Exception during parsing:
	NegativeHits: Got negative hit value in gcov line 'branch  1 taken -1' caused by a bug in gcov tool, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68080. Use option --gcov-ignore-parse-errors with a value of negative_hits.warn, or negative_hits.warn_once_per_file.
(WARNING) Exception during parsing:
	NegativeHits: Got negative hit value in gcov line 'branch  1 taken -1' caused by a bug in gcov tool, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68080. Use option --gcov-ignore-parse-errors with a value of negative_hits.warn, or negative_hits.warn_once_per_file.
(ERROR) Exiting because of parse errors.
	You can run gcovr with --gcov-ignore-parse-errors
	to continue anyway.
(WARNING) Unrecognized GCOV output for /__w/iguana/iguana/iguana_src/src/iguana/services/YAMLReader.cc
	  branch  1 taken -1
	  branch  1 taken -1
	This is indicative of a gcov output parse error.
	Please report this to the gcovr developers

(excludes the ~4000 additional lines; see CI logs for full reports)

Note

coverage tests disabled in #305