fix: remove unused onboarding components #7635

Job	Run time
When staking change	5s
When core changed	8s
Build Lace	7m 43s
Prepare	6m 57s
Run Chromatic check: Core	4m 36s
Unit tests	10m 26s
Run Chromatic check: Staking	4s
Release package	7m 34s
Smoke e2e tests (1)	5m 6s
Smoke e2e tests (2)	3m 45s
Smoke e2e tests (3)	3m 41s
Smoke e2e tests (4)	7m 19s
Smoke e2e tests (5)	3m 49s
Smoke e2e tests (6)	3m 40s
Smoke e2e tests (7)	4m 59s
Smoke e2e tests (8)	4m 32s
Smoke e2e tests (9)	3m 17s
Smoke e2e tests (10)	3m 17s
Smoke e2e tests (11)	3m 7s
Smoke e2e tests (12)	10m 2s
Smoke e2e tests (13)	6m 28s
Smoke e2e tests (14)	3m 36s
Smoke e2e tests (15)	3m 25s
Smoke e2e tests (16)	2m 58s
Process smoke e2e test reports	18s
	1h 50m 52s

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