fix(project-template): Remove build scripts from target

[mbektchiev]

Otherwise, they ended up being included in the app bundle.

The following files have been removed from the app target in the project template:

• nativescript-pre-build
• nativescript-post-build
• nativescript-pre-link
• strip-dynamic-framework-architectures.sh
• nsld.sh

PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• You have signed the CLA.
• All existing tests are passing: https://github.com/NativeScript/ios-runtime/blob/master/CONTRIBUTING.md#contribute-to-the-code-base
• Tests for the changes are included.

Note To avoid regressing this, we should add integration tests that verify that no unexpected files appear in the built app bundles!