Clean up STF request_vc call #8016

Job	Run time
parachain-dynamic-contract-test	19s
set-condition	10s
fmt	1m 29s
sequentialise	2s
parachain-build-dev	5m 48s
bitacross-build	1m 11s
parachain-clippy	0s
parachain-runtime-test	0s
parachain-unit-test	0s
identity-build	13m 27s
tee	24m 59s
bitacross	16m 18s
lit-sign-bitcoin	3m 38s
litentry	1m 59s
rococo	1m 16s
lit-di-substrate-identity-test	10m 10s
lit-di-evm-identity-test	8m 50s
lit-di-bitcoin-identity-test	7m 41s
${{ matrix.test_name }}	0s
lit-di-solana-identity-test	7m 49s
lit-dr-vc-test	8m 21s
lit-parentchain-nonce	6m 34s
lit-test-failed-parentchain-extrinsic	7m 56s
lit-twitter-identity-test	6m 58s
lit-discord-identity-test	6m 44s
lit-assertion-contracts-test	7m 32s
push-docker	0s
	2h 29m 11s

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