Validate Question Titles Using Query

[noce2]

Validation of question titles in the Question Authoring page performs a GET request for a question of some title. If a 404 is returned, the Question Title Validator indicates the question is valid and allows a user to proceed. The problem with this is that all 404s register SEVERE errors in the Chrome Browser console (might do the same in other browsers) which causes e2e tests to fail (because they assert no server logs are present).

The scope of this issue is to modify the validation of a question title to use a search query as described here: https://github.com/math-dojo/question-service/blob/f844c71837f605aa2fa012aed58d27f549d1ab0b/openapi.yaml#L126

Acceptance Criteria:

• A new method for searching for questions based on their title is created in the Question Service
• The validator is modified to return a validation response based on whether matching results are found in the array of QuestionDtos
• The line in the question authoring e2e test for sanitising logs is removed.

[noce2]

Will be resolved by #69