[Bug] Sync logs off on poor connection

[eliserichards]

https://bugzilla.mozilla.org/show_bug.cgi?id=1684346

User Agent: Mozilla/5.0 (Android 10; Mobile; rv:86.0) Gecko/86.0 Firefox/86.0
Firefox for Android

Steps to reproduce:

My phone suffers from poor connectivity. This has not been an issue for Firefox until some recent update. Now sync logs me out randomly throughout the day. Logging back in is difficult under my unreliable connection, and is further hampered since I use 2FA. However, this isn't the issue, the issue is that a bad connection should not result in being permanently logged out but should log one back in on re-establishing the connection even when using 2FA.

Expected results:

Remain logged in after reconnecting.

┆Issue is synchronized with this Jira Task

[grigoryk]

A poor connection would case network errors to be more likely. Sounds like we may erroneously end-up in a logged-out state as a result of some network operation failing - likely during startup when we initialize the account.

For some context, as of mozilla-mobile/android-components#7856 error transitions became more explicit, and in PRs like mozilla-mobile/android-components#8498 we've been various "network error causes problems" problems. Perhaps 7856 is the reason why user reports this as a "recent" regression.

[jonalmeida]

Re-opened back in bugzilla as part of issue migration: https://bugzilla.mozilla.org/show_bug.cgi?id=1684346