Make resource discovery not terminating when hitting an error depending on use case

[SteveL-MSFT]

Summary of the new feature / enhancement

Currently, during discovery if there is any error, the entire operation fails. Instead we need to consider the usage:

• if part of a configuration, if the error is not related to the resources actually being used, we can ignore any errors and only emit a message to stderr if --verbose is used
• if part of dsc resource list, we can emit a warning type message to stderr but continue discovery listing the results
• if direct resource invocation, if that resource is being used, then fail, otherwise same as config above

Proposed technical implementation details (optional)

No response