Remove logout from background requests

[bjtitus]

A duplicate of #2534 applied to 7.79 since the 7.80 release will be delayed a couple of weeks.

I think we should get these into testing ASAP as I've seen a number of recent tickets with similar behavior:

9138117-zd-a8c
8737139-zd-a8c
9118472-zd-a8c
9204151-zd-a8c

To test

• Apply this patch (ForcedLogoutRefresh.patch) to either this branch or trunk
• Add a breakpoint at AppDelegate:110 in didFinishLaunching after scheduleNextBackgroundRefresh() is called.
• Build and run the app
• When the breakpoint is hit, background the app
• Execute this command in the debug console to trigger the scheduled background refresh task:

e -l objc -- (void)[[BGTaskScheduler sharedScheduler] _simulateLaunchForTaskWithIdentifier:@"au.com.shiftyjelly.podcasts.Refresh"]

• Before this change, you should have been logged out
• After this change, you should see TokenHelper: Skipped logout in background due to error logged

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 7.79 ❄️. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

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