The "on_budget_investments" scope in Activity has never been used
anywhere in the codebase. It was introduced in commit d9d38482b3
("extends Activity to include Investment valuations") but no references
were ever added.
Instead of removing it, we make use of the scope by adding the missing
"Budget investments" filter to the admin Activity section. This aligns
it with the rest of the activity filters and gives the scope the purpose
it was originally intended for.
We were very inconsistent regarding these rules.
Personally I prefer no empty lines around blocks, clases, etc... as
recommended by the Ruby style guide [1], and they're the default values
in rubocop, so those are the settings I'm applying.
The exception is the `private` access modifier, since we were leaving
empty lines around it most of the time. That's the default rubocop rule
as well. Personally I don't have a strong preference about this one.
[1] https://rubystyle.guide/#empty-lines-around-bodies
