Merge branch 'bc/fix-chat-rspec-tests' into 'master'

Drop regex based testing of Duo Chat answers

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/141816



Merged-by: Alejandro Rodríguez <alejandro@gitlab.com>
Approved-by: Alejandro Rodríguez <alejandro@gitlab.com>
Approved-by: Gosia Ksionek <mksionek@gitlab.com>
Co-authored-by: Bruno Cardoso <bcardoso@gitlab.com>