Integrate battery optimization dialog into onboarding

Current situation

After completing the onboarding, users are facing a series of dialogs that ask them to disable battery optimizations (along with some additional information on exposure notifications). Those dialogs are merely a popup, potentially annoying and not looking important to users.

Dialog with information on exposure notifications	Dialog asking users to disable battery optimizations	Additional dialog if battery optimizations are disabled

Suggested improvement

The onboarding flow should contain a page that asks users to disable battery optimizations.

Expected benefits

The onboarding flow feels better when it is actually complete when it seems to be done, instead of being followed by more popup dialogs. The rate of users who disable battery optimizations might improve, which would be good.

See also

#2682 Warn about deactivated battery optimization on main screen #1606 Improve UX for disabling battery optimization (an issue about using ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS)

For any readers having trouble disabling the battery optimization, there are some instructions in the FAQ https://www.coronawarn.app/en/faq/#no_risk_update about how to do this.

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Internal Tracking ID: EXPOSUREAPP-5965

[dsarkar]

@MikeMcC399 I added your comment to OP. Thanks.

[MikeMcC399]

For any readers having trouble disabling the battery optimization, there are some instructions in the FAQ https://www.coronawarn.app/en/faq/#no_risk_update about how to do this.