fix: set a default name for job identity-multi-worker-test #8269

Job	Run time
set-condition	11s
fmt	1m 11s
sequentialise	3s
tee-check	27m 20s
identity-build	1m 56s
parachain-build-dev	5m 0s
bitacross-build	1m 16s
parachain-clippy	0s
parachain-runtime-test	0s
parachain-unit-test	0s
lit-sign-bitcoin	3m 34s
litentry	1m 1s
rococo	1m 8s
lit-di-substrate-identity-test	4m 21s
paseo	1m 3s
lit-di-evm-identity-test	4m 27s
${{ matrix.test_name \|\| 'identity-multi-worker-test' }}	0s
lit-di-bitcoin-identity-test	3m 30s
lit-di-solana-identity-test	3m 46s
lit-dr-vc-test	3m 52s
lit-parentchain-nonce	3m 27s
lit-test-failed-parentchain-extrinsic	3m 32s
lit-twitter-identity-test	3m 36s
lit-discord-identity-test	3m 28s
push-docker	0s
	1h 17m 42s

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