feat(ttd): `TimeToInitialDisplay` and `TimeToFullDisplay` start the time to display spans on mount #3370

Job	Run time
diff_check / diff_check	8s
cancel-previous-workflow	2s
Build legacy android dev no-frameworks	4m 39s
Build legacy android production no-frameworks	6m 27s
Build legacy ios dev no-frameworks	13m 43s
Build legacy ios production no-frameworks	14m 47s
Build legacy macos dev no-frameworks	14m 22s
Build legacy macos production no-frameworks	17m 33s
Build legacy ios dev dynamic-frameworks	12m 8s
Build legacy ios production dynamic-frameworks	14m 0s
Build new android dev no-frameworks	4m 55s
Build new android production no-frameworks	6m 7s
Build new ios dev no-frameworks	16m 19s
Build new ios production no-frameworks	19m 10s
	2h 24m 20s

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