Flow ID editing UI messages and error state

[lukestanley]

We want to:

1. Warn when a Flow ID is uppercase (warning UI style).
2. Suggest lowercase kebab style names for new Flow ID's, using the Lodash kebab case function (informative UI style).
3. Show an error for ID's that use characters that are not in an allowed list. The allowed list of characters are: lowercase letters, uppercase letters, dashes, numbers characters. Characters such as space, emojis or anything else are not allowed. This should cause an error style UI. We need to enforce that when trying to uploading a new or existing Flow, that users cannot progress until the ID complies with the allowed character rules.