Polish `identity_iota_core` (#1203) #4458

Job	Run time
check-for-run-condition	1s
check-for-modification	5s
build-wasm / build-wasm (ubuntu-latest)	5m 54s
build-and-test (ubuntu-latest)	22m 7s
build-and-test (macos-latest)	21m 1s
build-and-test (windows-latest)	26m 18s
test-wasm (ubuntu-latest)	8m 39s
	1h 24m 5s

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