Add common network errors to retry policy

[adreed-msft]

Description

• Feature / Bug Fix: Covers a couple additional errors we're seeing in an IcM

• Related Links:

• ICM 21000000787291

Type of Change

• Bug fix
• New feature
• Documentation update required
• Code quality improvement
• Other (describe):

How Has This Been Tested?

Retry policy adapted

[Copilot]

Pull request overview

This PR extends the retry policy to handle additional network errors encountered in production incidents. The changes add OS-agnostic error detection for common network failures that should trigger retries.

• Adds retry logic for io.ErrUnexpectedEOF, io.EOF, and net.ErrClosed errors
• Includes comprehensive test coverage for the new error conditions
• Reorganizes imports following Go conventions (stdlib separated from third-party packages)

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ste/xferRetryHelper.go	Adds error checks for common network errors (io.ErrUnexpectedEOF, io.EOF, net.ErrClosed) to the retry policy and organizes imports
ste/xferRetryHelper_test.go	Adds test cases to verify the new network errors trigger retries as expected and organizes imports

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