Log command being run to generate with openapi-generator-cli

Shouldn't need to dig in the audit DB for this - need to be more transparent.

Also should log errors even in non-verbose mode.

No file or test is named; first locate the openapi-generator-cli integration and the audit DB logging path. Verify how command execution and errors are logged in verbose and non-verbose modes, then confirm that the generated command and errors are visible without querying the audit DB.

Written by the indexing model from the issue text.