Add and test events in `pallet-conviction-voting` #14164

Job	Run time
check-dependency-rules	12s
check-fail-ci	16s
check-markdown	14s
check-readme	20s
check-workspace	17s
preflight / preflight	15s
preflight / ci-versions	1s
fmt	1s
check-rust-feature-propagation	1s
test-rust-features	1s
check-toml-format	1s
check-umbrella	1s
All quick checks passed	1s
	1m 41s

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