Remove AccountKeyring everywhere #7219

Job	Run time
preflight / preflight	41s
preflight / ci-versions	56s
cargo-check-all-crate-macos	12m 11s
cargo-check-benches (master)	20m 56s
cargo-check-each-crate (1)	18m 6s
cargo-check-benches (current)	24m 40s
cargo-check-each-crate (2)	23m 45s
test-frame-ui	27m 11s
cargo-check-each-crate (3)	7m 53s
test-full-crypto-feature	2m 33s
cargo-check-each-crate (4)	20m 30s
test-node-metrics	11m 11s
cargo-check-each-crate (5)	29m 42s
cargo-check-each-crate (6)	14m 8s
cargo-check-each-crate (7)	31m 53s
test-frame-examples-compile-to-wasm	3m 6s
test-deterministic-wasm	6m 11s
check-tracing	2m 17s
check-metadata-hash	5m 57s
node-bench-regression-guard	10s
All test misc tests passed	1s
	4h 23m 58s

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