At the moment there is no way to turn on the verbose logging for `ng update` and `ng add`. This is useful for use so that when users report issues such as npmrc is not read we can see the lookup locations.
This also removes some reduncant that were being provided in `executeSchematic`.
Related to https://github.com/angular/angular-cli/issues/14993
This ensures that migration fields that reference other packages use the package version specified in the migrating package's dependencies and not the version that a package manager happens to hoist to the root of the workspace.
If not asking for update status then this change checks for a clean git repository before proceeding. This allows the user to easily reset any changes from the update and avoid any developer code changes from being mixed with update changes.
This adds extensive option checking and error handling with the goal to catch user errors as early in the process as possible. Bad option combinations and/or values will result in actionable information and stop the process before network access and processing occurs.
