build-git-installers: migrate macOS and Linux off ESRP #1766

Job	Run time
config	6s
linux-musl (alpine)	3m 5s
pedantic (fedora)	3m 3s
linux32 (daald/ubuntu32:xenial)	3m 2s
documentation	3m 18s
sparse	3m 16s
win+VS build (arm64)	3m 3s
static-analysis	3m 17s
win+VS build (x64)	3m 4s
win build	3m 17s
linux-asan-ubsan (ubuntu-latest)	3m 17s
linux-gcc (ubuntu-20.04)	3m 19s
linux-gcc-default (ubuntu-latest)	3m 18s
linux-leaks (ubuntu-latest)	3m 19s
linux-sha256 (ubuntu-latest)	3m 17s
linux-TEST-vars (ubuntu-20.04)	3m 21s
osx-clang (macos-12)	3m 27s
osx-gcc (macos-12)	3m 17s
win+VS test	0s
win test	0s
	55m 6s

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