fix(ios): Guard replay postInit behind runtime session replay check #12336

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	3s
diff_check / diff_check	9s
Build legacy macos dev no-frameworks	5m 52s
Build legacy ios production no-frameworks	9m 24s
Build legacy android dev no-frameworks	9m 12s
Build legacy ios production dynamic-frameworks	9m 37s
Build new android dev no-frameworks	11m 26s
Build new ios dev no-frameworks	10m 47s
Build legacy ios dev no-frameworks	12m 59s
Build legacy android production no-frameworks	9m 59s
Build new ios production no-frameworks	10m 26s
Build legacy ios dev dynamic-frameworks	8m 50s
Build legacy macos production no-frameworks	6m 25s
Build new android production no-frameworks	12m 26s
Test android production REV2	6m 8s
Test ios production REV2	4m 47s
	2h 8m 30s

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