[Identity] Decouple usernames from identities #4428

Job	Run time
preflight / preflight	48s
preflight / ci-versions	1m 9s
test-frame-ui	46m 55s
test-node-metrics	10m 36s
cargo-check-benches (master)	20m 27s
cargo-check-all-crate-macos	10m 44s
cargo-check-benches (current)	23m 9s
cargo-check-each-crate (1)	23m 49s
test-full-crypto-feature	2m 42s
cargo-check-each-crate (2)	20m 5s
cargo-check-each-crate (3)	7m 23s
cargo-check-each-crate (4)	20m 58s
cargo-check-each-crate (5)	29m 10s
cargo-check-each-crate (6)	14m 36s
cargo-check-each-crate (7)	31m 37s
test-frame-examples-compile-to-wasm	3m 6s
test-deterministic-wasm	7m 52s
check-tracing	2m 29s
node-bench-regression-guard	14s
check-metadata-hash	7m 0s
All test misc tests passed	1s
	4h 44m 50s

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