Upgrade: Rails version 7.1 (#4735)

This commit:
* Run bundle update
* Run `app:update` task and resolve conflicts in config & env files
* Run safe autocorrect fixes for new Rubocop offences
* Add rubocop-rspec_rails to Rubcop config
* Manually fix new unsafe Rubcop offences
  * Requires fixing some specs as some elements became ambiguous due to
    preferring more generic `click_on` Capybara helper instead of `click_link`
* Add generators to new `autoload_lib` configuration
  * Because: CI breaks otherwise
* Access schema migration object via base connection in Heroku task
  * Because: This behaviour was removed in rails 7.1.
    See https://github.com/rails/rails/blob/7-1-stable/activerecord/CHANGELOG.md
* Toggle low risk framework defaults for Rails 7.1

Author: ChargrilledChook

.rubocop.yml

@@ -2,6 +2,7 @@ require:
   - rubocop-performance
   - rubocop-rails
   - rubocop-rspec
+  - rubocop-rspec_rails
   - rubocop-capybara
   - rubocop-factory_bot
 

Gemfile

@@ -2,7 +2,7 @@ ruby File.read('.ruby-version').strip
 
 source 'https://rubygems.org'
 
-gem 'rails', '7.0.8.1'
+gem 'rails', '7.1.3.4'
 
 gem 'aasm', '~> 5.3'
 gem 'barnes', '~> 0.0'