Add support for transfer data Azure Files NFS <-> Azure Files SMB

[dphulkar-msft]

Description

SMB → NFS

1. Symlinks (There will be no symlink for SMB share)
   --preserve-symlinks: N/A fail job
   --follow-symlinks: N/A fail the job
2. Hardlinks (There will be no symlink for SMB share)
   --hardlinks: N/A fail the job
3. Azure Files SMB will only contain normal files (no symlinks or hardlinks).
4. If --preserve-info is set, preserve creationTime and lastModifiedTime.
5. If --preserve-permissions is set, do not preserve — log error: "Preserving cross-platform permissions is not supported."

NFS → SMB

1. Symlinks: Skip and log (no symlink api support for SMB).
2. Hardlinks: Skip and log (no hardlink api support for SMB).
3. For NFS → SMB transfers, --hardlinks must be set to skip. Hardlinked files will always be skipped during this transfer.
4. If --preserve-info is set, preserve creationTime and lastModifiedTime.
5. If --preserve-permissions is set, do not preserve — log error: "Preserving cross-platform permissions is not supported."

• Feature / Bug Fix: (Brief description of the feature or issue being addressed)

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Type of Change

• Bug fix
• New feature
• Documentation update required
• Code quality improvement
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How Has This Been Tested?

Thank you for your contribution to AzCopy!

[Copilot]

Pull Request Overview

This PR begins adapting the codebase to support transfers between Azure Files NFS and SMB by relaxing protocol checks and adding a guard in the traversal logic.

• Added a nil-check around processStoredObject in the file traverser
• Commented out the SMB protocol validation in flagsValidation.go
• Commented out the NFS unsupported checks in copy.go

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
cmd/zc_traverser_file.go	Added if s != nil guard before calling processStoredObject
cmd/flagsValidation.go	Commented out the SMB-vs-NFS compatibility validation block
cmd/copy.go	Commented out NFS unsupported-transfer checks in copy logic