Use SwapMatrixRows/Columns in a few places (#5839) #5870

Job	Run time
Cross compiler for s390x	27m 21s
testinstall - - ubuntu-latest	4m 31s
Test in OpenBSD	8m 1s
teststandard - - ubuntu-latest	19m 4s
testmanuals - - ubuntu-latest	6m 1s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	6m 54s
testpackages testinstall-loadall - - ubuntu-latest	25m 53s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	5m 23s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	18m 6s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	7m 32s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	4m 41s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	30m 31s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	4m 49s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	4m 14s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug" - ubuntu-20.04	4m 53s
testmockpkg testinstall - - windows-2019	15m 31s
Send Slack notification on status change	4s
	3h 13m 29s

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