Revert "collect C++ code coverage (#23619)"

This reverts commit a97b2e613b275f407576ddb3d7a3bd52b05f612a.

old-commit-hash: a62e9140908f40f6966d977373e9d458bd9a53d2

SConstruct

@@ -52,11 +52,6 @@ AddOption('--no-thneed',
           dest='no_thneed',
           help='avoid using thneed')
 
-AddOption('--coverage',
-          action='store_true',
-          dest='coverage',
-          help='outpute covarge information')
-
 real_arch = arch = subprocess.check_output(["uname", "-m"], encoding='utf8').rstrip()
 if platform.system() == "Darwin":
   arch = "Darwin"
@@ -173,10 +168,6 @@ else:
   ccflags = []
   ldflags = []
 
-if GetOption('coverage'):
-  ccflags += ["-fprofile-arcs", "-ftest-coverage"]
-  ldflags += ["-fprofile-arcs", "-ftest-coverage"]
-
 # no --as-needed on mac linker
 if arch != "Darwin":
   ldflags += ["-Wl,--as-needed", "-Wl,--no-undefined"]
@@ -294,10 +285,6 @@ elif arch == "aarch64":
 else:
   envCython["LINKFLAGS"] = ["-pthread", "-shared"]
 
-if GetOption('coverage'):
-  envCython['CCFLAGS'] += ["-fprofile-arcs", "-ftest-coverage"]
-  envCython['LINKFLAGS'] += ["-fprofile-arcs", "-ftest-coverage"]
-
 Export('envCython')
 
 # Qt build environment