feat!: remove "Create Zendesk Tickets for suspicious attempts" setting from Proctored Exam Settings (#2517)

BREAKING CHANGE: This PR removes the deprecated “Create Zendesk Tickets for suspicious attempts”
setting from the Proctored Exam Settings modal in the frontend-app-authoring
MFE. This option was previously used with PSI and Zendesk to generate support
tickets for suspicious exam attempts. Since both systems are retired, the
setting no longer serves a purpose and has been fully removed.

Part of: https://github.com/openedx/edx-platform/issues/36329

src/course-outline/__mocks__/courseOutlineIndex.js

@@ -62,7 +62,6 @@ module.exports = {
     highlightsPreviewOnly: false,
     highlightsDocUrl: 'https://docs.openedx.org/en/latest/educators/how-tos/course_development/manage_course_highlight_emails.html',
     enableProctoredExams: true,
-    createZendeskTickets: true,
     enableTimedExams: true,
     childInfo: {
       category: 'chapter',

src/course-unit/__mocks__/courseSectionVertical.js

@@ -1405,7 +1405,6 @@ module.exports = {
           highlights_preview_only: false,
           highlights_doc_url: 'https://docs.openedx.org/en/latest/educators/how-tos/course_development/manage_course_highlight_emails.html',
           enable_proctored_exams: false,
-          create_zendesk_tickets: true,
           enable_timed_exams: true,
           ancestor_has_staff_lock: false,
           user_partition_info: {