[Feature Request]: Report number of skipped files when importing from Kettle

### What would you like to happen?

When doing a re-import from an already imported folder, the total number of files is reported. There is a really helpful option «Skip existing target files». Unfortunately the number of skipped files is not reported in the «Import Summary» screen.
There it says e.g. Imported: 37 jobs. When skipping is enabled, this information is not correct. It should display e.g. «Imported 2 jobs, 35 skipped.».
Not mentioning skipped files gives the user a feeling of uncertainty, letting her/him doubt, if any files might have been overwritten (which could be a shocking situation, depending of the changes done meanwhile...).
Of course, this feature is nice to have, since soon all files from Kettle in this world will be converted... ;-) Maybe depending on the speed the courageous, ambitious and hope-giving apache hop team can fix all the bugs and desires that have accumulated over the years. Keep on, do the important work first.

### Issue Priority

Priority: 3

### Issue Component

Component: Hop Gui

Start in Hop Gui's Import Summary flow and trace the Kettle import path, including the “Skip existing target files” option. Confirm the existing imported count and skipped count, then verify that a re-import summary reports both values.

Written by the indexing model from the issue text.