Use SwapMatrixRows/Columns in a few places #5857

Job	Run time
Cross compiler for s390x	2h 10m 28s
Test in OpenBSD	10m 33s
testinstall - - ubuntu-latest	35m 32s
teststandard - - ubuntu-latest	47m 56s
testmanuals - - ubuntu-latest	1h 0m 22s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	38m 18s
testpackages testinstall-loadall - - ubuntu-latest	58m 2s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	16m 8s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	17m 30s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	44m 49s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	24m 40s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	25m 25s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	16m 13s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	5m 22s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug" - ubuntu-20.04	53m 54s
testmockpkg testinstall - - windows-2019	1h 0m 8s
Send Slack notification on status change	7s
	10h 45m 27s

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