[kv store] json rpc: remove leftover call sites to old events API #80527

Job	Run time
diff	11s
license-check	1m 5s
test (ubuntu-ghcloud)	29m 0s
windows-build (windows-ghcloud)	9m 10s
simtest	15m 32s
test-extra (ubuntu-ghcloud)	26m 39s
cargo-deny (bans, licenses, sources)	35s
cargo-deny (advisories)	34s
clippy	3m 27s
move-test	0s
rustfmt	19s
test-extra	0s
test	0s
cutting a new execution layer	1m 24s
	1h 27m 56s

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