Ignore test/expectations/ for sorbet

[Earlopain]

A expecation currently does something like this:

def method
end

This makes it impossible to call Object.method while keeping sorbet happy. There is only one file that sorbet should know about in that folder, just move that somewhere else.

Also fixes two RuboCop offenses in that file since it was previously ignored.

[user@DESKTOP-PC ruby-lsp]$ bundle exec srb
lib/ruby_lsp/requests/support/rubocop_formatter.rb:39: Non-private call to private method method on RubyLsp::Requests::Support::RuboCopRunner https://srb.help/7031
    39 |          @diagnostic_runner.method(:"123")
                                     ^^^^^^
    test/expectations/code_actions_formatting/rubocop_multiline_string.exp.rb:1: Defined in Object here
     1 |def method
        ^^^^^^^^^^

lib/ruby_lsp/requests/support/rubocop_formatter.rb:39: Too many arguments provided for method Object#method. Expected: 0, got: 1 https://srb.help/7004
    39 |          @diagnostic_runner.method(:"123")
                                            ^^^^^^
    test/expectations/code_actions_formatting/rubocop_multiline_string.exp.rb:1: method defined here
     1 |def method
        ^^^^^^^^^^
  Autocorrect: Use -a to autocorrect
    lib/ruby_lsp/requests/support/rubocop_formatter.rb:39: Delete
    39 |          @diagnostic_runner.method(:"123")
                                            ^^^^^^
Errors: 2

Motivation

I want to inspect a methods parameters in order to call an updated RuboCop APi while staying compatible with older versions.