Fix container failure output

[nohwnd]

PR Summary

When container fails, the parameters were not splatted correctly which ends up failing when there are more than 1 errors.

When we capture an error that has not stack trace, like when Import-Module is called directly in the body of test, for module that is missing, we would append new line to the resulting error. This will fail the mandatory parameter validation for Format CI message, and throw.

I removed appending the new line, and relaxed the parameter rule, because I don't think writing the error should fail when it has a format that is little bit unexpected.

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