chore(main): release google-cloud-asset-v1 1.8.0 #105351

Job	Run time
CI (ubuntu-latest, 3.1, --test)	46s
CI (ubuntu-latest, 3.2, --test)	1m 16s
CI (ubuntu-latest, 3.3, --test)	1m 11s
CI (ubuntu-latest, 3.4, --test)	1m 7s
CI (ubuntu-latest, 4.0, --rubocop-toplevel --rubocop --build --yard --linkinator)	1m 27s
CI (macos-latest, 4.0, --test)	54s
CI (ubuntu-latest, 4.0, --test)	57s
CI (windows-latest, 4.0, --test)	3m 10s
	10m 48s

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