cleaning up old SDK's kernel files from the CLI's kernel cache #49707
Description
Users that use pub's precompile pipeline and the new --resident mode with the dart run CLI command keep kernel files in the .dart_tool directory of the package the compilation took place in. These kernel files have a suffix in their names that indicate which version of the SDK they were produced for to prevent any version mismatching.
When the Dart version is upgraded, the old version's kernel files are left in the .dart_tool directory. These should be cleaned up somehow.