Move Account management unit tests to go mock server

[nagadeesh-nagaraja]

remove all account management unit test mock up logic from mockup.go and redfish_local.go
and move them into go mock server

[coderabbitai]

🔗 Related PRs

#643 - Refactor mock server [merged]
#790 - Move BMCSettings mock redfish_local method into go mock server [merged]
#829 - Move BMC and BIOS Version CRDs unit test to go mock server [merged]

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