feat: support external ID lookup for parts in playout model

Author: justandras

packages/job-worker/src/playout/model/implementation/PlayoutSegmentModelImpl.ts

@@ -3,6 +3,7 @@ import { ReadonlyDeep } from 'type-fest'
 import { DBSegment, SegmentOrphanedReason } from '@sofie-automation/corelib/dist/dataModel/Segment'
 import { DBPart } from '@sofie-automation/corelib/dist/dataModel/Part'
 import { PlayoutSegmentModel } from '../PlayoutSegmentModel.js'
+import { unprotectString } from '@sofie-automation/corelib/dist/protectedString.js'
 
 export class PlayoutSegmentModelImpl implements PlayoutSegmentModel {
 	readonly #segment: DBSegment
@@ -20,7 +21,7 @@ export class PlayoutSegmentModelImpl implements PlayoutSegmentModel {
 	}
 
 	getPart(id: PartId): ReadonlyDeep<DBPart> | undefined {
-		return this.parts.find((part) => part._id === id)
+		return this.parts.find((part) => part._id === id || part.externalId === unprotectString(id))
 	}
 
 	getPartIds(): PartId[] {