Describe the bug
Hook code snippets that are returned by both _get_all_hooks and _get_all_hooks_internal are not de-duplicated, which can lead to rendering problems when const declarations are re-defined.

To Reproduce

import reflex as rx


class State(rx.State):
    """The app state."""
    v: str = "v"


class Foo(rx.Fragment):
    bar: rx.Var[str]

    def add_hooks(self) -> list[str]:
        return [
            rx.Var(f"console.log({self.bar})")
        ]

    def render(self):
        return {}


def index() -> rx.Component:
    return Foo.create(bar=State.v)


app = rx.App()
app.add_page(index)

Expected behavior
All hooks code should always be de-duplicated.

Specifics (please complete the following information):

• Python Version: 3.12
• Reflex Version: 0.6.7.dev1
• OS: macOS
• Browser (Optional): chrome

Additional context
Care should be taken in regard to hook ordering (internal should always come first) and avoiding extra recursive calls (don't call _get_all_hooks_internal inside _get_all_hooks to avoid performance implications)