Migrations are failing for certain scenarios

[dkamburov]

Description

Member migration fails for the following scenario:

event.grid.onSomeEvent.subscribe

• igniteui-angular version: 12.0.0
• browser:

Steps to reproduce

1. Build migrations for the following PR
2. Apply those migrations in samples repo
3. Open hierarchical-grid-custom-kb-navigation-sample.component.ts file

Result

onGridKeydown failed to migrate to gridKeydown

Expected result

onGridKeydown should migrate to gridKeydown
Scenarios like event.grid.onSomeEvent.subscribe should be migrated

[zdrawku]

While upgrading the angular-samples project to 12.1.0-alpha.1 version I've noticed that the migrations were applied only to the templates and not the .ts files as well.

Steps to reproduce:

• open igniteui-angular-samples project
• checkout to branch test-migrations-before-12-1-0-alpha-1
• run npm i [email protected]
• run ng g igniteui-angular/migrations/migration-collection.json:migration-21

Observe the changes:

• template:
  

• component: