fix: add support for @angular/core/types/core.d.ts path

[alomardev]

Description

This PR fixes an issue where the Angular Language Service extension does not recognize @angular/core when its declaration file is located at @angular/core/types/core.d.ts.

Problem

The extension only checked for Angular core at these two paths:

• @angular/core/core.d.ts
• @angular/core/index.d.ts

When Angular core is at @angular/core/types/core.d.ts, the extension fails to detect it and does not initialize the language service.

Solution

Added @angular/core/types/core.d.ts to the list of checked paths in the isExternalAngularCore(...) function.

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[alan-agius4]

This has been addressed in extension version 20.3.3