[UI] [Conditions] Process TokenizingTextBox doesn't filter processes while typing

The current implementation of TokenizingTextBox feels buggy and is not user friendly.

- The list should appear already after the user just clicks on the field, not after he starts typing. If possible.
- The list should filter while typing, just like shown in the example of Microsoft for the AutoSuggestbox. If i type "adob" the list should only show processes with the string "adob" in the title.

Review the TokenizingTextBox implementation and the changes in merged pull request #1259 first, since the issue has linked work. Confirm that focusing the field shows the process list and that typing filters it by title, then verify the behavior in the Conditions UI.

Written by the indexing model from the issue text.