Insufficient logs when failing to install a module via Managed Dependencies

[AnatoliB]

When a required module is mentioned in requrements.psd1 and this module installation fails, PowerShell worker logs the error reported by the Save-Module cmdlet. However, this error message is often too generic: Unable to save the module X. This message is not helpful and not actionable. In the meantime, Save-Module may report more valuable messages to the Warning stream, but PowerShell worker does not log those, which makes the investigation difficult.

For example, the AWSPowerShell.NetCore module cannot be installed via Managed Dependencies on Consumption because it is too large to fit into D:\local\Temp. The error message we are getting now is still Unable to save the module X. The warning produced by Save-Module would point the user to the right direction: Package 'AWSPowerShell.NetCore' failed to be installed because: There is not enough space on the disk. : 'D:\local\Temp\250686550\AWSPowerShell.NetCore.4.0.6.0\AWSPowerShell.NetCore.dll-Help.xml'.

So, let's log warnings produced by Save-Module.