fix(exports): Return `lastEventId` (#4315) #4785

Job	Run time
diff_check / diff_check	2s
Build legacy android dev no-frameworks	4m 54s
Build legacy android production no-frameworks	6m 11s
Build legacy ios dev no-frameworks	19m 39s
Build legacy ios production no-frameworks	20m 41s
Build legacy macos dev no-frameworks	13m 15s
Build legacy macos production no-frameworks	14m 37s
Build legacy ios dev dynamic-frameworks	14m 48s
Build legacy ios production dynamic-frameworks	19m 53s
Build new android dev no-frameworks	6m 47s
Build new android production no-frameworks	7m 47s
Build new ios dev no-frameworks	20m 34s
Build new ios production no-frameworks	27m 9s
	2h 56m 17s

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