Importmap:install loads rakefile twice

[Greg-Myers-SB]

This will not cause a problem with vast majority of applications, but could if someone changes the state of something global in the rakefile.
This also differs with most other rake tasks in that running webpack:install or yarn:install will only load the rakefile once.

Reproduction

rails new foo
cd foo

add puts 'In Rakefile' to top line of Rakefile

bin/rails importmap:install

Expected

Code runs

In Rakefile
normal output

Actual

In Rakefile
In Rakefile
normal output