fix(exports): Return `lastEventId` #4784

Job	Run time
diff_check / diff_check	10s
Build legacy android dev no-frameworks	4m 18s
Build legacy android production no-frameworks	5m 46s
Build legacy ios dev no-frameworks	21m 48s
Build legacy ios production no-frameworks	18m 0s
Build legacy macos dev no-frameworks	11m 26s
Build legacy macos production no-frameworks	12m 54s
Build legacy ios dev dynamic-frameworks	21m 3s
Build legacy ios production dynamic-frameworks	25m 3s
Build new android dev no-frameworks	5m 55s
Build new android production no-frameworks	7m 28s
Build new ios dev no-frameworks	20m 5s
Build new ios production no-frameworks	21m 11s
	2h 55m 7s

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