fix: resolve export warnings on posthog provider (#1670) #8100

Job	Run time
Build Lace	6m 55s
When core changed	6s
When staking change	5s
Prepare	6m 23s
Run Chromatic check: Staking	3s
Release package	6m 24s
Run Chromatic check: Core	1s
Unit tests	9m 37s
Smoke e2e tests (1)	3m 39s
Smoke e2e tests (2)	3m 16s
Smoke e2e tests (3)	3m 4s
Smoke e2e tests (4)	5m 12s
Smoke e2e tests (5)	3m 18s
Smoke e2e tests (6)	3m 3s
Smoke e2e tests (7)	4m 44s
Smoke e2e tests (8)	4m 11s
Smoke e2e tests (9)	2m 27s
Smoke e2e tests (10)	2m 6s
Smoke e2e tests (11)	2m 28s
Smoke e2e tests (12)	8m 12s
Smoke e2e tests (13)	10m 14s
Smoke e2e tests (14)	2m 54s
Smoke e2e tests (15)	3m 13s
Smoke e2e tests (16)	2m 3s
Process smoke e2e test reports	22s
	1h 34m 0s

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