chore: Remove private kernel snapshot test #4637

Job	Run time
setup / start-builder	6s
setup / setup	13s
bb-bench-binaries	14s
bb-native-tests	11s
build	6m 12s
setup-bench / start-builder	1m 2s
setup-bench / setup	21s
bb-bench	13s
e2e (cli-docs-sandbox)	1m 0s
e2e (e2e-browser)	1m 23s
e2e (e2e-docs-examples)	57s
e2e (e2e-sandbox-example)	1m 33s
e2e (e2e-tests)	8m 30s
e2e (guides-dapp-testing)	2m 58s
e2e (guides-writing-an-account-contract)	1m 0s
e2e (integration-l1-publisher)	1m 51s
e2e (pxe)	40s
e2e (uniswap-trade-on-l1-from-l2)	5m 42s
merge-check	1s
notify	0s
	34m 7s

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