Remove second argument from STOP_TEST invocations (#5823) #5787

Job	Run time
testinstall - - ubuntu-latest	4m 54s
Cross compiler for s390x	28m 6s
teststandard - - ubuntu-latest	19m 0s
testmanuals - - ubuntu-latest	5m 58s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	7m 5s
testpackages testinstall-loadall - - ubuntu-latest	27m 27s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	7m 38s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	18m 31s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	7m 20s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	4m 22s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	28m 0s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	4m 19s
Test in OpenBSD	8m 27s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	4m 48s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug --disable-Werror" - ubuntu-20.04	5m 2s
testmockpkg testinstall - - windows-2019	15m 53s
Send Slack notification on status change	3s
	3h 16m 53s

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