perf(azure): eliminate fleet lists from slot reads #1502

Job	Run time
Repo invariants	5s
Behavior test shard plan	8s
Lint shell scripts	9s
Behavior tests (focused Azure service)	1m 52s
Agent Fleet package	0s
Behavior tests (shard ${{ matrix.shard }}/8)	0s
Behavior tests	5s
	2m 19s

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