Use config context for all cop specs

* Add shared context for all cop specs.
* Remove redundant `config` metadata for cop specs.
* Remove redundant `cop` subjects from cop specs.

Author: sl4vr

spec/rubocop/cop/rspec/align_left_let_brace_spec.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::AlignLeftLetBrace do
-  subject(:cop) { described_class.new }
-
   # rubocop:disable RSpec/ExampleLength
   it 'registers offense for unaligned braces' do
     expect_offense(<<-RUBY)

spec/rubocop/cop/rspec/align_right_let_brace_spec.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::AlignRightLetBrace do
-  subject(:cop) { described_class.new }
-
   # rubocop:disable RSpec/ExampleLength
   it 'registers offense for unaligned braces' do
     expect_offense(<<-RUBY)

spec/rubocop/cop/rspec/any_instance_spec.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::AnyInstance do
-  subject(:cop) { described_class.new }
-
   it 'finds `allow_any_instance_of` instead of an instance double' do
     expect_offense(<<-RUBY)
       before do

spec/rubocop/cop/rspec/around_block_spec.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::AroundBlock do
-  subject(:cop) { described_class.new }
-
   context 'when no value is yielded' do
     it 'registers an offense' do
       expect_offense(<<-RUBY)

spec/rubocop/cop/rspec/be_eql_spec.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::BeEql do
-  subject(:cop) { described_class.new }
-
   it 'registers an offense for `eql` when argument is a boolean' do
     expect_offense(<<-RUBY)
       it { expect(foo).to eql(true) }

spec/rubocop/cop/rspec/be_spec.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::Be do
-  subject(:cop) { described_class.new }
-
   it 'registers an offense for `be` without an argument' do
     expect_offense(<<-RUBY)
       it { expect(foo).to be }

spec/rubocop/cop/rspec/before_after_all_spec.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::BeforeAfterAll do
-  subject(:cop) { described_class.new }
-
   def message(hook)
     "Beware of using `#{hook}` as it may cause state to leak between tests. "\
     'If you are using `rspec-rails`, and `use_transactional_fixtures` is '\

spec/rubocop/cop/rspec/capybara/current_path_expectation_spec.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::Capybara::CurrentPathExpectation do
-  subject(:cop) { described_class.new }
-
   it 'flags violations for `expect(current_path)`' do
     expect_offense(<<-RUBY)
       expect(current_path).to eq("/callback")

spec/rubocop/cop/rspec/capybara/feature_methods_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-RSpec.describe RuboCop::Cop::RSpec::Capybara::FeatureMethods, :config do
+RSpec.describe RuboCop::Cop::RSpec::Capybara::FeatureMethods do
   it 'flags violations for `background`' do
     expect_offense(<<-RUBY)
       describe 'some feature' do

spec/rubocop/cop/rspec/capybara/visibility_matcher_spec.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::RSpec::Capybara::VisibilityMatcher do
-  subject(:cop) { described_class.new }
-
   it 'registers an offense when using `visible: true`' do
     expect_offense(<<-RUBY)
       expect(page).to have_selector('.my_element', visible: true)