chore: remove duplicate TelemetryMap and TelemetryEvents types in core services

[ryaverma]

Issue

The types TelemetryMap and TelemetryEvents are defined twice in :-

• packages/core-services/src/types/ITelemetryEvent.ts
• packages/rest-typings/src/v1/statistics.ts

This duplication is already flagged with a TODO comment in ITelemetryEvent.ts // TODO this is duplicated from /packages/rest-typings/src/v1/statistics.ts

Fix

Import TelemetryMap and TelemetryEvents from rest-typings and remove the duplicate definitions from ITelemetryEvent.ts.