Merge branch 'zj-format-chat-messages' into 'master'

app/models/project_services/chat_slash_commands_service.rb

changelogs/unreleased/zj-format-chat-messages.yml

lib/gitlab/chat_commands/base_command.rb

lib/gitlab/chat_commands/command.rb

lib/gitlab/chat_commands/deploy.rb

lib/gitlab/chat_commands/help.rb

lib/gitlab/chat_commands/issue_new.rb

lib/gitlab/chat_commands/issue_search.rb

lib/gitlab/chat_commands/issue_show.rb

lib/gitlab/chat_commands/presenter.rb

lib/gitlab/chat_commands/presenters/access.rb

lib/gitlab/chat_commands/presenters/base.rb

lib/gitlab/chat_commands/presenters/deploy.rb

lib/gitlab/chat_commands/presenters/help.rb

lib/gitlab/chat_commands/presenters/issuable.rb

lib/gitlab/chat_commands/presenters/issue_new.rb

lib/gitlab/chat_commands/presenters/issue_search.rb

lib/gitlab/chat_commands/presenters/issue_show.rb

spec/lib/gitlab/chat_commands/command_spec.rb

spec/lib/gitlab/chat_commands/deploy_spec.rb