Merge generate_package_release_notes.py into release_notes.py #5035

Job	Run time
testinstall - - ubuntu-latest	4m 14s
teststandard - - ubuntu-latest	31m 12s
testmanuals - - ubuntu-latest	5m 55s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	6m 33s
testpackages testinstall-loadall - - ubuntu-latest	28m 38s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	5m 16s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	28m 53s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	6m 49s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	4m 59s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	22m 54s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	3m 41s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	2m 56s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug --disable-Werror" - ubuntu-20.04	4m 15s
testmockpkg testinstall - - windows-2019	14m 51s
Send Slack notification on status change	0s
	2h 51m 6s

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