Fix for Conditional Question removed answers not being deleted from UI and DB.

[johnpinto1]

In the case of the UI, the answers were just hidden. They would reappear if the conditional question option that removed them was changed. This was not noticed as an issue, because any export of plan would never show the hidden answers. A user noticed this bug.

Changes:

• We remove the hidden answers from the UI using javascript function deleteAllAnswersForQuestion() in app/javascript/src/utils/sectionUpdate.js, see https://github.com/DMPRoadmap/roadmap/blob/bfb5d0a75ae8d4d56d67b4ba3b1c595b74b13ea9/app/javascript/src/utils/sectionUpdate.js#L32-L56
• We delete the persisted answers (that were removed by the conditional question option selected) in the db and persist the change before sending a refreshed list of questions to remove in app/controllers/answers_controller.rb, see https://github.com/DMPRoadmap/roadmap/blob/bfb5d0a75ae8d4d56d67b4ba3b1c595b74b13ea9/app/controllers/answers_controller.rb#L101C6-L130C39
• Updated the RSpec tests taking into account fact that the Conditional question option mave require removal of questiond in different sections in a phase (i,e, plan tab).

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