[MS-1541] Stop event sync retries on network connection failure

[meladRaouf]

MS-1541
Will be released in: 2026.3.0

Root cause analysis (for bugfixes only)

First known affected version: 2026.3.0

• When the device is offline, EventUpSyncTask.uploadEventScopeType retries uploading closed event scopes in a while loop with no delay/backoff.
• Each failed upload attempt calls authStore.getFirebaseToken() under the hood, which throws NetworkConnectionException when FirebaseAuthManager can't reach the network. This is caught and unconditionally logs a new EventUpSyncRequestEvent, unlike the success path which only logs when there's useful content.
• Because the failed scope is never deleted, the loop's exit condition (getClosedEventScopesCount(...) > 0) stays true, so it retries immediately with no backoff — spinning indefinitely while offline and creating a new event on every iteration, which shows up as accumulating extra events on the dashboard sync screen.

Changes

• EventUpSyncTask.uploadEventScopeType: when the upload fails with a NetworkConnectionException, break out of the retry loop for that scope type instead of retrying immediately, deferring the retry to the next scheduled sync attempt. This limits the failure to a single logged event per sync run while offline instead of an unbounded tight loop.

Testing guidance

• To verify manually: put the device in airplane mode with pending events to sync, trigger a sync, and confirm the sync screen event count stops growing after a single failed attempt instead of climbing continuously.

Additional work checklist

• Effect on other features and security has been considered
• Design document marked as "In development" (if applicable)
• External (Gitbook) and internal (Confluence) Documentation is up to date (or ticket created)
• Test cases in Testiny are up to date (or ticket created)
• Other teams notified about the changes (if applicable)

[luhmirin-s]

@meladRaouf can you please stack this on top of #1783? There was a significant rework and it might need slightly different approach.