chore: Revert Init Redesign

[CoshUS]

Revert for PRs: #2958 and #3211

Following are some of the issues preventing release:

1. All integration tests in samcli\commands\init\interactive_init_flow.py are broken. Prompts are not matching inputs thus hanging process.
2. Using set for listing dependency managers will cause undetermined ordering

valid_dep_managers = (
        RUNTIME_TO_DEPENDENCY_MANAGERS.get(runtime)
        if not options
        else list(set(template["dependencyManager"] for template in options))
    )

Let's run and pass all integration tests before merge in future PRs.

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