fix: Remove unnecessary conformance from MetricKit models (#6943) #17089

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	5s
Detect File Changes	4s
Test iOS Objective-C on Cirrus Labs V3 / UI Tests Common	2m 44s
Test tvOS Swift on Cirrus Labs V3 / UI Tests Common	1m 34s
Test SwiftUI on Cirrus Labs V4 / UI Tests Common	3m 0s
Test iOS Swift6 on Cirrus Labs V3 / UI Tests Common	2m 56s
Test Swift iOS 18 on Cirrus Labs V5 / UI Tests Common	10m 50s
Test Swift iOS 17 on Cirrus Labs V5 / UI Tests Common	9m 37s
Test Swift iOS 26 on Cirrus Labs V5 / UI Tests Common	12m 6s
UI Tests	3s
	42m 59s

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