notification_open logs twice when passing the intent to another Activity

[lehcar09]

Issue is created on behalf of the Developer.

Originally posted by @SteveBurkert in #3799 (comment)

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@gsakakihara 

Hey there,

I don't want to open a new ticket for this, since my problem is kind of coming from the same source, the 
`FcmLifecycleCallbacks`. 

Just to add, the callbacks do not only not recognize `onNewIntent` calls, but they also do not recognize
if the same intent was already used for logging.

Use Case Example: 

1. LaunchActivity (which is called by fcm notification with data in Intent) 
2. SomeOtherActivity which is called from LaunchActivity

If the LaunchActivity blindly forwards it's Intent data to the "SomeOtherActivity" for any reasons,
the `notification_open` event will be tracked twice, because the `FcmLifecycleCallbacks` is invoked
two times.

This can easily be avoided, but was not easy to find. So this is more an additional info for you.

Maybe it's a good idea to check if the intent from `onCreate` is coming from an activity 
with `category.LAUNCHER` Intent-filter first, before pushing the fcm event. But thats not 
to me to decide.

Have a great day,
Cheers

[lehcar09]

Hey @SteveBurkert, thank you for reaching out. I was able to reproduce the issue you reported. I'll notify our engineers about this and also the possible fix you suggested. Thank you for that. I'll get back to you once I hear from them.