fix(ami-housekeeper): don't delete referenced AMIs in default config #5915

Job	Run time
Verify module (1.5.6)	28s
Verify module (latest)	15s
Verify examples (1.5.6, prebuilt)	33s
Verify examples (1.5.6, ephemeral)	28s
Verify examples (1.5.6, default)	31s
Verify examples (1.5.6, termination-watcher)	26s
Verify examples (latest, default)	24s
Verify examples (1.5.6, multi-runner)	30s
Verify examples (1.5.6, external-managed-ssm-secrets)	34s
Verify examples (latest, prebuilt)	19s
Verify modules (1.5.6, multi-runner)	18s
Verify examples (latest, external-managed-ssm-secrets)	18s
Verify modules (1.5.6, runner-binaries-syncer)	18s
Verify examples (latest, multi-runner)	17s
Verify modules (1.5.6, download-lambda)	17s
Verify examples (latest, ephemeral)	22s
Verify modules (1.5.6, webhook)	18s
Verify modules (latest, ami-housekeeper)	14s
Verify modules (1.5.6, ssm)	16s
Verify modules (1.5.6, termination-watcher)	16s
Verify modules (latest, download-lambda)	17s
Verify modules (1.5.6, ami-housekeeper)	18s
Verify modules (1.5.6, lambda)	16s
Verify modules (1.5.6, runners)	18s
Verify examples (latest, termination-watcher)	15s
Verify modules (latest, termination-watcher)	13s
Verify modules (latest, lambda)	16s
Verify modules (latest, runner-binaries-syncer)	15s
Verify modules (1.5.6, setup-iam-permissions)	19s
Verify modules (latest, multi-runner)	14s
Verify modules (latest, setup-iam-permissions)	15s
Verify modules (latest, runners)	17s
Verify modules (latest, ssm)	14s
Verify modules (latest, webhook)	17s
	11m 6s

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