Refactor FA cookie management and enhance testing

- Updated the FA cookie management in the Scraper::FaHttpClientConfig class to validate cookie formats and handle cookies more robustly.
- Removed the fa.yml configuration file and integrated cookie retrieval directly within the class.
- Added comprehensive tests for cookie handling in the new fa_http_client_config_spec.rb file.
- Updated the Gemfile to include parallel_tests in the test and development group.
- Modified the .rspec file to enable color output for better readability in test results.
- Simplified test commands in the justfile for improved usability.
- Adjusted the rails_helper.rb to ensure the test environment is correctly set up.

Gemfile

@@ -89,11 +89,14 @@ group :test do
   gem "webdrivers"
   gem "shoulda-matchers"
   gem "factory_bot_rails"
-  gem "parallel_tests"
   gem "pundit-matchers", "~> 4.0"
   gem "db-query-matchers", "~> 0.14"
 end
 
+group :test, :development do
+  gem "parallel_tests"
+end
+
 gem "xdiff", path: "/gems/xdiff-rb"
 
 # for legacy import