[FRAME] Simplify pallet config definition: remove `RuntimeEvent` associated type #13574

Job	Run time
isdraft / isdraft	1s
preflight / preflight	47s
preflight / ci-versions	57s
test-full-crypto-feature	2m 27s
cargo-check-benches (master)	19m 46s
cargo-check-benches (current)	23m 38s
cargo-check-all-crate-macos	10m 1s
cargo-check-each-crate (1)	7m 30s
test-frame-ui	11m 39s
cargo-check-each-crate (2)	7m 28s
test-node-metrics	13m 51s
cargo-check-each-crate (3)	7m 25s
cargo-check-each-crate (4)	7m 25s
cargo-check-each-crate (5)	7m 25s
cargo-check-each-crate (6)	7m 27s
cargo-check-each-crate (7)	7m 18s
test-frame-examples-compile-to-wasm	2m 48s
test-deterministic-wasm	7m 27s
check-tracing	2m 6s
check-metadata-hash	7m 55s
node-bench-regression-guard	18s
All test misc tests passed	1s
	2h 35m 40s

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