🧹 Modernize GCP provider with Go 1.21+ idioms #16142

Job	Run time
go-mod	37s
golangci-lint	1m 45s
go-test	3m 17s
go-race	50s
go-test-integration	35s
Store event file	6s
golangci-lint-providers / lint	2m 31s
go-auto-approve	0s
	9m 41s

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