Ok so apparently the scripts in angular.json were in conflict with the scripts in the index.html, so, overall these are the modifications

1. angular.json

   "scripts": [],

2. index.html: kept the scripts with the CDNs

3. tsconfig.json: updated the right path for the type "d.ts"

4. leaflet.d.ts: introduced the class Geodesic instead of namespace.

5. Cleared package.json of any leaflet packages