misc: Removes deprecated Sentry.metrics API #4559

Job	Run time
diff_check / diff_check	6s
Build legacy android dev no-frameworks	3m 50s
Build legacy android production no-frameworks	5m 20s
Build legacy ios dev no-frameworks	16m 28s
Build legacy ios production no-frameworks	16m 53s
Build legacy macos dev no-frameworks	11m 38s
Build legacy macos production no-frameworks	9m 16s
Build legacy ios dev dynamic-frameworks	16m 51s
Build legacy ios production dynamic-frameworks	16m 25s
Build new android dev no-frameworks	5m 41s
Build new android production no-frameworks	6m 58s
Build new ios dev no-frameworks	18m 22s
Build new ios production no-frameworks	17m 36s
	2h 25m 24s

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