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feat(@schematics/angular): add migration to add istanbul-lib-instrument
fix(@schematics/angular): use null objects and callbacks in karma-to-vitest migration
fix(@schematics/angular): add trusted-proxy-headers migration
feat(@angular/build): rename `experimentalPlatform` to `platform` in application builder
fix(@schematics/angular): silently skip when the build target already uses one of the new builders