Implement background time threshold check for modal message display.

[anikiki]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1200581511062568/task/1212290309897024?focus=true

Description

Added a background time threshold check to the RemoteMessageModalSurfaceEvaluator. The modal will now only be shown if the app has been in the background for at least 4 hours. This prevents the modal from appearing too frequently when users are actively using the app.

Steps to test this PR

Background time threshold

• On this branch, change the threshold to 1 min in RemoteMessageModalSurfaceEvaluatorImpl: BACKGROUND_THRESHOLD_MILLIS = 60 * 1000L
• Put the app in background for less than 1 min, then bring it to foreground - modal should not appear
• Put the app in background for more than 1 min, then bring it to foreground - modal should appear if other conditions are met

NO UI changes

[anikiki]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

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• develop

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