Add rubocop-rspec_rails gem and enable HTTP status name consistency

Adds the rubocop-rspec_rails gem to provide Rails-specific RSpec linting.

Enables the RSpecRails/HttpStatusNameConsistency cop to enforce using
:unprocessable_content instead of the deprecated :unprocessable_entity
for HTTP 422 status codes.

Sets NewCops to disabled to prevent automatic enablement of new cops in
future gem updates, allowing us to evaluate and enable them deliberately.

Author: giverm

template/{{app_name}}/.rubocop.yml

@@ -1,9 +1,13 @@
 plugins:
   - rubocop-rspec
+  - rubocop-rspec_rails
 inherit_gem:
   pundit: config/rubocop-rspec.yml
   rubocop-rails-omakase: rubocop.yml
 
+AllCops:
+  NewCops: disable
+
 RSpec/ExampleLength:
   Enabled: false
 RSpec/MultipleExpectations:
@@ -13,5 +17,8 @@ RSpec/NoExpectationExample:
     - assert_
     - is_expected_in_block
 
+RSpecRails/HttpStatusNameConsistency:
+  Enabled: true
+
 Style/FrozenStringLiteralComment:
   Enabled: true

template/{{app_name}}/Gemfile

@@ -97,6 +97,7 @@ group :development do
   # Linting
   gem "rubocop-rails-omakase", require: false
   gem "rubocop-rspec", require: false
+  gem "rubocop-rspec_rails", require: false
 
   # Test notifications locally without sending the emails
   gem "letter_opener"

template/{{app_name}}/Gemfile.lock

@@ -446,6 +446,10 @@ GEM
     rubocop-rspec (3.7.0)
       lint_roller (~> 1.1)
       rubocop (~> 1.72, >= 1.72.1)
+    rubocop-rspec_rails (2.32.0)
+      lint_roller (~> 1.1)
+      rubocop (~> 1.72, >= 1.72.1)
+      rubocop-rspec (~> 3.5)
     ruby-graphviz (1.2.5)
       rexml
     ruby-progressbar (1.13.0)
@@ -558,6 +562,7 @@ DEPENDENCIES
   rspec-rails (~> 8.0.0)
   rubocop-rails-omakase
   rubocop-rspec
+  rubocop-rspec_rails
   selenium-webdriver
   simplecov
   sprockets-rails