refactor: drop direct AWS SDK use from workflow core #2484

Job	Run time
Cloud-SDK inventory + k8s-backend init() partition + asymmetric graph audit	24s
Verify godo is not imported (issue	6s
Verify removed AWS SDK packages are not imported (issue	5s
Go Mod Tidy	32s
UI Tests	30s
Validate Example Configs	-1s
Lint Examples	-1s
Build	-1s
Test (Go ${{ matrix.go-version }})	-1s
Lint	-1s
Build Examples	-1s
	1m 31s

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