Feat: Script tests to templates

[cbrzn]

This PR aims to add a test script for templates packages, making sure that they are not broken when a new release happens.

To achieve this, the following steps are being done:

• Iterate over all the folders inside of templates package, except for scripts and node_modules
• If the folder contains a package.json file, we read it and check if has a build script, if it does, the command yarn && yarn build && yarn test is executed, otherwise, it's only yarn && yarn test
• If the package.json does not have a test script, an error is thrown. This is to make sure that all the templates have tests
• If any command fails, an error is returned