V2 Fix subcategory names in All Tools (and search) pane (#4252)

# Description of Changes
Because we used string typing for IDs and names, it was really easy to
make mistakes where variables named like `subcategory` would be stored
as an ID in one file, but then read assuming it's a name in another
file. This PR changes the code to consistently use enum cases when
referring to IDs of categories, subcategories, and tools (at least in as
many places as I can find them, ~I had to add a `ToolId` enum for this
work~ I originally added a `ToolId` type for this work, but it caused
too many issues when merging with #4222 so I've pulled it back out for
now).

Making that change made it obvious where we were inconsistently passing
IDs and reading them as names etc. allowing me to fix rendering issues
in the All Tools pane, where the subcategory IDs were being rendered
directly (instead of being translated) or where IDs were being
translated into names, but were then being re-translated, causing
warnings in the log.