fix(push): Prevent Unintended OptOuts

[tylerjroach]

• PR title and description conform to Pull Request guidelines.

Issue #, if available:

Description of changes:

Issue #1
During Amplify's configuration, a call is made to the FirebaseMessaging sdk to grab the token. However, this call is asynchronous (FirebaseMessaging.getInstance().token.addOnCompleteListener) and if a Amplify.Notifications.Push.identifyUser() call is made before the token is returned, it will not locate the token and send OptOut = NONE.

Issue #2
Amplify Push Notifications and Amplify Analytics are appearing to conflict with one another. Each library updates the same endpoint/profile. Each time an analytics endpoint is sent (or even configured), it will send an endpoint update without the token and push channel type. This results in OptOut = All getting set. I was able to observe this by creating a sample app with 2 buttons. The first button called Amplify.Notifications.Push.identifyUser(). The second button called Amplify.Analytics.identifyUser(). When the push button was clicked, the profile was updated with OptOut = NONE. When the analytics button was clicked, OptOut = ALL becomes set.

How did you test these changes?
(Please add a line here how the changes were tested)

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #2587 (55139df) into main (fdba2d9) will decrease coverage by 0.08%.
The diff coverage is 21.05%.

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