Remove AccountKeyring everywhere #7204

Job	Run time
preflight / preflight	1m 19s
preflight / ci-versions	1m 7s
test-full-crypto-feature	2m 33s
test-frame-ui	27m 5s
cargo-check-benches (master)	21m 14s
cargo-check-benches (current)	20m 35s
test-node-metrics	8m 29s
cargo-check-all-crate-macos	11m 7s
cargo-check-each-crate (1)	16m 22s
cargo-check-each-crate (2)	17m 32s
cargo-check-each-crate (3)	7m 56s
cargo-check-each-crate (4)	14m 43s
cargo-check-each-crate (5)	22m 27s
cargo-check-each-crate (6)	13m 6s
cargo-check-each-crate (7)	47m 23s
test-frame-examples-compile-to-wasm	3m 6s
test-deterministic-wasm	6m 33s
check-tracing	2m 20s
check-metadata-hash	5m 56s
node-bench-regression-guard	12s
All test misc tests passed	1s
	4h 11m 6s

Provide feedback