Upgrade to Decidim 0.27

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🎩 What? Why?

This PR takes care of upgrading Decidim version to 0.27.8

https://github.com/decidim/decidim/releases/tag/v0.27.0

Steps to run after the deploy

dokku run decidim-terrassa bundle exec rails decidim:upgrade:moderation:remove_from_search
dokku run decidim-terrassa rails decidim_comments:update_participatory_process_in_comments
dokku run decidim-terrassa rails runner -e production 'Decidim::Category.pluck(:id, :name, :description).map { |row| puts row.join(";") }'
dokku run decidim-terrassa rails runner -e production 'Decidim::User.find_each { |u| puts "Processing user #{u.id}" ; u.try_update_index_for_search_resource }'
dokku run decidim-terrassa rails decidim:upgrade:fix_nickname_uniqueness

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Geocoding working in PRO: