[NT-1055] LandingPage deeplink handling bug fix

[Scollaco]

📲 What

Fixes a bug where a LandingPage is presented and immediately dismissed if the app is launched through deeplink.

🤔 Why

It's a bug and we don't like bugs.

🛠 How

• This was caused by a race condition between the goToLandingPage and the deeplinkActivated. So in order to solve this, a take(until:) function was added to prevent the deeplinkActivated from emitting if goToLandingPage already emitted.

👀 See

Before 🐛	After 🦋

✅ Acceptance criteria

In order to test this, follow the steps:

1. Set Launch setting to Wait for executable to be launched
2. On line 1116, return true immediately after the open bracket:

   private func shouldGoToLandingPage() -> Bool { return true
   

3. Add a 2 sec delay to the `openUrl` property:

let openUrl = self.applicationOpenUrlProperty.signal
.delay(2, on: AppEnvironment.current.scheduler)
.skipNil()

4. Build the app on a device in the release configuration
5. Click the link to open the app through deeplink. I tested using [this link]( https://www.kickstarter.com/projects/chelsea-punk/chelsea-punk-band-the-final-album))

- [ ] The landing page should be presented on the first time.
- [ ] Close the app and tap the link again. The app should show the Project Page and the Landing Page should **not** be presented.

[ifbarrera]

Can we actually run this test with a project deeplink? The output that was being triggered during the bug was presentViewController, which first dismisses any previously presented VC.

[ifbarrera]

Nice!