Allow unblocking email addresses from any matching account (#29305)

spec/fabricators/canonical_email_block_fabricator.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
 Fabricator(:canonical_email_block) do
-  email { sequence(:email) { |i| "#{i}#{Faker::Internet.email}" } }
+  email { |attrs| attrs[:reference_account] ? attrs[:reference_account].user_email : sequence(:email) { |i| "#{i}#{Faker::Internet.email}" } }
   reference_account { Fabricate.build(:account) }
 end