[WIP] Refactor tests to utilize TestCommandFails

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Refactor tests to use TestCommandFails</issue_title>
<issue_description>In the tmstest folder, ps1 files, find all occurrences of code similar to this:

$installResult = Invoke-WithExitCodeIgnored{ tms install vsoft.* tms.biz.*  }
$testOk = Test-Result -CommandResult $installResult -Message "*Error: The product tms.biz.bcl is excluded in the section ""excluded products"" from tms.config.yaml.*"  
if (-not ($testOk)) {   
    Write-Error "The error message should mention 'Error: The product tms.biz.bcl is excluded in the section ""excluded products"" from tms.config.yaml.'. Actual message: $($installResult)"
}

And replace it for the equivalent:

Test-CommandFails -Command { tms install vsoft.* tms.biz.* } -ExpectedMessage "*Error: The product tms.biz.bcl is excluded in the section ""excluded products"" from tms.config.yaml.*"
```</issue_description>

<agent_instructions>Use the versioning branch</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Refactor tests to use TestCommandFails #22

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[agallero]

copilot didn't work here, so I did the same locally