Non-happy path Flows - test, document, improve

[03cranec]

Alert user on build and dev cli and test cli

Including, but not limited to:

• Folder structure doesn't match function definition
• Infinite cycle. They've got a Foo -> Bar flow, then Bar -> Foo flow
• Having a file called anything except "flow.ts"
• Not having a file called "flow.ts" in the folder
• Anything beyond one function defined in each file
• Having more than one file per folder
• When a user makes typescript mistakes, show those compilation errors in the user facing logs

[linear[bot]]

514-657 Detect / manage folder structure misalignment with flow function definition