test-module.ps1 ignores local Az.Accounts even though its version is higher

[isra-fel]

test-module.ps1 uses locally installed Az.Accounts if its version is higher than the embedded one, but it didn't and caused the test cases of Functions to fail.

To reproduce

git checkout main
git reset --hard upstream/main
git checkout -b functions-update-stacks-may-2025-base

# generate code
autorest --reset
autorest --powershell  --debug --verbose 3>&1 2>&1 > log.txt

# build module
.\build-module.ps1

# run tests
.\test-module.ps1 -Playback

Tests completed in 9.32s
Tests Passed: 0, Failed: 64, Skipped: 18, Pending: 0, Inconclusive: 0


PS C:\Users\x\code\azure-powershell\src\Functions\Functions.Autorest [68.08s]> gmo az.accounts -li

    Directory: C:\Users\x\Documents\PowerShell\Modules

ModuleType Version    PreRelease Name                                PSEdition ExportedCommands
---------- -------    ---------- ----                                --------- ----------------
Script     4.2.0                 Az.Accounts                         Core,Desk {Disable-AzDataCollection, Disable-AzContextAutosave, Enable-AzDataCollection, Enable-AzContextAutosave…}

    Directory: C:\Program Files\WindowsPowerShell\Modules

ModuleType Version    PreRelease Name                                PSEdition ExportedCommands
---------- -------    ---------- ----                                --------- ----------------
Script     4.0.2                 Az.Accounts                         Core,Desk {Disable-AzDataCollection, Disable-AzContextAutosave, Enable-AzDataCollection, Enable-AzContextAutosave…}

Mannually remove the one in .\generated\modules\Az.Accounts can workaround this problem.

[isra-fel]

Now autorest will use the generated Az.Accounts with higher priority than installed Az.Accounts. Need to reverse it or upgrade the built-in accounts module