Remove AccountKeyring everywhere #3786

Job	Run time
preflight / preflight	43s
preflight / ci-versions	55s
cargo-check-benches (master)	20m 4s
cargo-check-each-crate (1)	39m 1s
cargo-check-benches (current)	23m 45s
test-frame-ui	29m 31s
test-full-crypto-feature	2m 27s
cargo-check-each-crate (2)	36m 36s
cargo-check-each-crate (3)	12m 35s
test-node-metrics	13m 32s
cargo-check-each-crate (4)	35m 35s
cargo-check-all-crate-macos	11m 35s
cargo-check-each-crate (5)	43m 11s
cargo-check-each-crate (6)	22m 55s
cargo-check-each-crate (7)	43m 13s
test-frame-examples-compile-to-wasm	2m 56s
check-tracing	2m 23s
test-deterministic-wasm	7m 27s
check-metadata-hash	7m 14s
node-bench-regression-guard	17s
All test misc tests passed	1s
	5h 55m 56s

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