fix: fix the false alarm while stopping syncing backup status

[derekbit]

Which issue(s) this PR fixes:

Issue longhorn/longhorn#10301

What this PR does / why we need it:

Use warning-level messages for context cancellation.

Special notes for your reviewer:

Additional documentation or context

[coderabbitai]

Walkthrough

This change updates the error handling in the linerTimer method of the BackupMonitor struct within the backup monitor module. The implementation now uses the github.com/pkg/errors package to distinguish between errors caused by context cancellation and other errors. Specifically, if the error is due to a canceled context, a warning is logged instead of an error message. No modifications were made to exported or public entities.

Changes

File	Change Summary
engineapi/backup_monitor.go	Introduced the github.com/pkg/errors package. Modified the linerTimer method to differentiate error logging: logs a warning when the error is due to context cancellation and logs an error for other error types.

Sequence Diagram(s)

sequenceDiagram
    participant BM as BackupMonitor.linerTimer
    participant WC as wait.PollUntilContextCancel
    participant L as Logger

    BM->>WC: Call PollUntilContextCancel(context)
    WC-->>BM: Return error (or nil)
    alt Error is due to context cancellation
        BM->>L: Log warning message
    else Other error encountered
        BM->>L: Log error message
    end

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Possibly Related PRs

• fix: change misleading error message to warning level #3316: Focuses on improving error handling and logging by adjusting the severity of logged messages based on the context of the error.

Suggested Reviewers

• james-munson
• c3y1huang
• innobead

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Reviewing files that changed from the base of the PR and between 5d5b188 and d83ad9d.

📒 Files selected for processing (1)

• engineapi/backup_monitor.go (2 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• engineapi/backup_monitor.go

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• GitHub Check: Build binaries
• GitHub Check: Summary

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