Make "why not promoted" information more discoverable in dartanalyzer tool #45546
Description
This is the companion to issue #44904, for the dartanalyzer command line tool.
Although we hope to deprecate dartanalyzer in the near term (1-2 quarters), the "why not promoted" feature is currently working and ready to ship in the next stable release. Since we haven't yet begun the deprecation process, I suspect that most customers of the command line analyzer probably still use dartanalyzer rather than dart analyze, so I think it makes sense to backport support for this feature to dartanalyzer.
The specific work that needs to be done is to change dartanalyzer so that it shows context information even when --verbose is not specified.