truncate_option to allow CASCADE mode alongside the default RESTRICT

[pat]

This is largely the hard work of @theGeorgous in #99, alongside the initiative of @nnishimura in #115 to rebase. I've added a couple of tests and ensured the argument is being passed through correctly.

Please attribute credit to @thegeorgeous - I just jumped in with these tweaks to help ensure it can be merged in as easily as possible.

[macosgrove]

@etagwerker This PR also fixes my issue upgrading to Rails 7.1, but this one has passing tests. Please merge as soon as possible.

[etagwerker]

@pat Looks good, thanks!

[mlarraz]

We have a gem that has an unconstrained dependency on database_cleaner and started failing CI after the latest release. It doesn't seem like we're doing anything out of the ordinary:

Failure/Error: DatabaseCleaner.clean_with(:truncation, pre_count: true)
ArgumentError:
  wrong number of arguments (given 1, expected 2)
# /workdir/vendor/bundle/ruby/3.3.0/gems/database_cleaner-active_record-2.2.1/lib/database_cleaner/active_record/truncation.rb:197:in `truncate_tables'
# /workdir/vendor/bundle/ruby/3.3.0/gems/database_cleaner-active_record-2.2.1/lib/database_cleaner/active_record/truncation.rb:204:in `pre_count_truncate_tables'
# /workdir/vendor/bundle/ruby/3.3.0/gems/database_cleaner-active_record-2.2.1/lib/database_cleaner/active_record/truncation.rb:24:in `block in clean'
# /workdir/vendor/bundle/ruby/3.3.0/gems/activerecord-7.1.5.1/lib/active_record/connection_adapters/postgresql/referential_integrity.rb:19:in `disable_referential_integrity'
# /usr/local/lib/ruby/3.3.0/delegate.rb:87:in `method_missing'
# /workdir/vendor/bundle/ruby/3.3.0/gems/database_cleaner-active_record-2.2.1/lib/database_cleaner/active_record/truncation.rb:22:in `clean'
# /workdir/vendor/bundle/ruby/3.3.0/gems/database_cleaner-core-2.0.1/lib/database_cleaner/cleaner.rb:65:in `clean_with'
# /workdir/vendor/bundle/ruby/3.3.0/gems/database_cleaner-core-2.0.1/lib/database_cleaner/cleaners.rb:40:in `block in clean_with'
# /workdir/vendor/bundle/ruby/3.3.0/gems/database_cleaner-core-2.0.1/lib/database_cleaner/cleaners.rb:40:in `each'
# /workdir/vendor/bundle/ruby/3.3.0/gems/database_cleaner-core-2.0.1/lib/database_cleaner/cleaners.rb:40:in `clean_with'
# /usr/local/lib/ruby/3.3.0/forwardable.rb:240:in `clean_with'
# /workdir/spec/support/database_cleaner.rb:6:in `block (2 levels) in <top (required)>'

Seems like maybe some call sites were missed when changing the method signature in this PR?

[etagwerker]

@mlarraz Thanks for bringing this up! I created #120 to keep track of it.