[GraphQL] Rework Event type #76304

Job	Run time
diff	9s
license-check	1m 16s
test-extra (ubuntu-ghcloud)	12m 39s
simtest	16m 13s
test (ubuntu-ghcloud)	23m 8s
move-auto-formatter-ci-test	0s
windows-build (windows-ghcloud)	8m 47s
cargo-deny (advisories, licenses, bans, ...)	32s
clippy	3m 34s
move-test	0s
test-extra	0s
rustfmt	21s
test	0s
cutting a new execution layer	3m 49s
	1h 10m 28s

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