fix: explicitly whitelist core folder name

[manoldonev]

Explicitly whitelist "core" folder name due to lerna/lerna#1932 to fix tns-template-health-survey-ng template:

tns run ios
Skipping node_modules folder! Use the syncAllFiles option to sync files from this folder.
Searching for devices...
Found peer TypeScript 3.1.6
src/app/consent/consent-review/consent/consent.component.ts(8,35): error TS2307: Cannot find module '../../../core/task-manager/steps'.
src/app/consent/consent-review/consent/consent.component.ts(9,36): error TS2307: Cannot find module '../../../core/task-manager/task-manager.service'.
src/app/consent/consent-sharing/consent-sharing.component.ts(4,36): error TS2307: Cannot find module '../../core/task-manager/steps'.
src/app/consent/consent-sharing/consent-sharing.component.ts(5,36): error TS2307: Cannot find module '../../core/task-manager/task-manager.service'.
src/app/consent/visual-consent/withdrawing/withdrawing.component.ts(4,35): error TS2307: Cannot find module '../../../core/task-manager/steps'.
src/app/consent/visual-consent/withdrawing/withdrawing.component.ts(5,36): error TS2307: Cannot find module '../../../core/task-manager/task-manager.service'.
src/app/login/registration/registration.component.ts(10,46): error TS2307: Cannot find module '../../core/task-manager/steps'.
src/app/login/registration/registration.component.ts(11,36): error TS2307: Cannot find module '../../core/task-manager/task-manager.service'.
src/app/survey/survey-boolean-question.component.ts(4,34): error TS2307: Cannot find module '../core/task-manager/steps'.
src/app/survey/survey-boolean-question.component.ts(5,36): error TS2307: Cannot find module '../core/task-manager/task-manager.service'.
src/app/survey/survey-date-question.component.ts(4,31): error TS2307: Cannot find module '../core/task-manager/steps'.
src/app/survey/survey-date-question.component.ts(5,36): error TS2307: Cannot find module '../core/task-manager/task-manager.service'.
src/app/survey/survey-text-question.component.ts(4,31): error TS2307: Cannot find module '../core/task-manager/steps'.
src/app/survey/survey-text-question.component.ts(5,36): error TS2307: Cannot find module '../core/task-manager/task-manager.service'.
Skipping prepare.

Also updated lerna to latest.

[lock]

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