Use the all matcher to check the existence of each path.

This change allows us to remove the `RSpec/IteratedExpectation` rule from `.rubocop_todo.yml` as we no longer iterate over each path to check existence.

Note: We this PR didn't change the subsequent test checking for the negative expectations as this isn't part of the rule (see: https://github.com/rubocop-hq/rubocop-rspec/issues/278).

Library/Homebrew/test/.rubocop_todo.yml

@@ -78,11 +78,6 @@ RSpec/InstanceVariable:
     - 'utils/git_spec.rb'
     - 'version_spec.rb'
 
-# Offense count: 1
-RSpec/IteratedExpectation:
-  Exclude:
-    - 'cask/artifact/uninstall_zap_shared_examples.rb'
-
 # Offense count: 1
 # Cop supports --auto-correct.
 RSpec/LeadingSubject:

Library/Homebrew/test/cask/artifact/uninstall_zap_shared_examples.rb

@@ -183,9 +183,7 @@ shared_examples "#uninstall_phase or #zap_phase" do
       end
 
       it "is supported" do
-        paths.each do |path|
-          expect(path).to exist
-        end
+        expect(paths).to all(exist)
 
         subject