fix: fix error in metrics.ts related to this.#cacheMissWindows.delete(firstKey) #889

Job	Run time
controller image	1m 28s
job matrix	13s
helpers	3m 42s
hello-pepr-alias	2m 27s
hello-pepr-config	2m 24s
hello-pepr-config-ignored-ns	2m 21s
hello-pepr-custom-rbac	5m 18s
hello-pepr-deletion-timestamp	2m 21s
hello-pepr-finalize	6m 43s
hello-pepr-hooks	2m 21s
hello-pepr-mutate	2m 23s
hello-pepr-ns-all	2m 17s
hello-pepr-ns-bounded	2m 20s
hello-pepr-ns-wrong	1m 33s
hello-pepr-onschedule	2m 58s
hello-pepr-reconcile-global	2m 25s
hello-pepr-reconcile-kind	2m 26s
hello-pepr-reconcile-kindns	2m 21s
hello-pepr-reconcile-kindnsname	2m 21s
hello-pepr-regex-name	2m 19s
hello-pepr-regex-ns-all	2m 17s
hello-pepr-regex-ns-bounded	2m 17s
hello-pepr-regex-ns-wrong	1m 30s
hello-pepr-store	3m 17s
hello-pepr-store-redact-logs	2m 21s
hello-pepr-validate	2m 37s
hello-pepr-watch	2m 26s
test-specific-version	1m 40s
	1h 11m 6s

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