Fix GetUser function parameter naming

Seif Hatemrequested to merge
seif-hatem/client-go:fix-getuser-options-naming into release-client-2.0

Summary

Fix GetUser function parameter naming inconsistency

Changes

  • Rename GetUsersOptions to GetUserOptions for consistency
  • Update GetUser function parameter to use pointer (*GetUserOptions)
  • Update interface definitions and mock implementations
  • Update all call sites to pass pointers

closes #2181 (closed)

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