POC: add Azure Storage Mover awareness nudge for copy

[ankurmicrosoft309]

Surface an opt-in informational note during 'azcopy copy' when the inferred source/destination pair and the flags used are covered by Azure Storage Mover, pointing users at the fully managed migration experience.

• Add cmd/storageMoverNudge.go: coverage matrix (FromTo), compatible-flag allow-list, and pure decision function evaluateStorageMoverOpportunity.

• Gate behind AZCOPY_STORAGE_MOVER_NUDGE env var (registered in azcopy env).

• Wire a single call into the copy command Run after FromTo inference.

• Add unit tests for covered/uncovered pairs and compatible/incompatible flags.

Description

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

• Related Links:

• Issues

• Team thread

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• [Email Subject]

Type of Change

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

How Has This Been Tested?

Thank you for your contribution to AzCopy!

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