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Cherry-Pick: Support adding any annotation to functions spec annotati… #250

Job	Run time
builds / compute-tags	2s
builds / build-operator / Build image	3m 2s
builds / build-nodejs22 / Build image	2m 16s
builds / build-nodejs20 / Build image	2m 20s
builds / build-python312 / Build image	2m 36s
builds / build-serverless-jobinit / Build image	2m 31s
builds / build-serverless-controller / Build image	2m 49s
builds / build-buildless-serverless-controller / Build image	3m 14s
builds / build-serverless-webhook / Build image	2m 34s
integrations / serverless-integration-test	10m 59s
integrations / operator-integration-test	2m 10s
integrations / git-auth-integration-test	3m 25s
integrations / btp-integration-test	0s
upgrades / operator-upgrade-test	3m 21s
upgrades / serverless-upgrade-test	10m 7s
	51m 26s

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