fix(tracing): Recover app start data when first navigation transaction is discarded #12216

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	5s
diff_check / diff_check	10s
Build legacy macos production no-frameworks	7m 4s
Build legacy macos dev no-frameworks	5m 56s
Build new ios production no-frameworks	10m 44s
Build legacy ios dev dynamic-frameworks	9m 11s
Build legacy ios dev no-frameworks	10m 32s
Build legacy android dev no-frameworks	9m 2s
Build new ios dev no-frameworks	10m 51s
Build legacy ios production no-frameworks	9m 6s
Build legacy ios production dynamic-frameworks	10m 41s
Build legacy android production no-frameworks	10m 50s
Build new android dev no-frameworks	11m 24s
Build new android production no-frameworks	11m 54s
Test android production REV2	6m 38s
Test ios production REV2	4m 44s
	2h 8m 52s

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