fix: execute correctly local build after cloud build from sidekick

[Fatme]

Reset prepare info when native platform status is not alreadyPrepared in order to ensure the project will be prepared and all properties of this._prepareInfo will be correctly populated.

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/nativescript-cli/blob/master/CONTRIBUTING.md#contribute-to-the-code-base
• Tests for the changes are included.

What is the current behavior?

The user is not able to execute local build after cloud from sidekick.

What is the new behavior?

The user is able to execute local build after cloud from sidekick.