Refs #18894 - Remove unused rake tasks

[jlsherrill]

No description provided.

[mention-bot]

@jlsherrill, thanks for your PR! By analyzing the history of the files in this pull request, we identified @ehelms, @lzap and @pitr-ch to be potential reviewers.

[jlsherrill]

i guess there were 'rake' tasks that weren't loaded at all before. These aren't actually rake tasks:

gettext.rake (?)
jshint.rake (not a rake task?)

And these error when running:
jsroutes.rake (uninitialized constant JsRoutes)
pretty_routes.rake (uninitialized constant ActionController::Routing)
simplecov.rake (Don't know how to build task 'minitest' )

are any of these still needed?

[ehelms]

They weren't loaded before so I doubt they are needed.