make required header error more consistent #5131

Job	Run time
SDK docs	1m 20s
Get minimum supported rust version	13s
Code Style	52s
Lint	29s
SDK docs - mgmt	21s
SDK docs - svc	23s
SDK Tests (stable, false)	3m 10s
SDK Tests (1.76, false)	2m 44s
SDK Tests (nightly, true)	2m 4s
WASM Tests (stable, false)	2m 23s
E2E Tests (stable, false)	1m 1s
WASM Tests (1.76, false)	1m 12s
WASM Tests (nightly, true)	2m 38s
E2E Tests (1.76, false)	2m 16s
E2E Tests (nightly, true)	1m 9s
	22m 15s

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