crypto: refactor WebCrypto AEAD algorithms auth tag handling #4078

Job	Run time
Build slim tarball	2m 11s
x86_64-darwin: with shared libraries	27m 40s
aarch64-linux: with shared libraries	18m 36s
x86_64-linux: with shared libraries	23m 7s
aarch64-darwin: with shared libraries	25m 8s
	1h 36m 42s

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