#418: Remove Calendar API V1 implementation and related endpoint

Eliminated the CalendarApiV1Controller and its associated iCal endpoint from the OpenAPI specification. This marks the removal of deprecated functionality to streamline the codebase and API surface.

src/main/resources/openapi/ExternalAPI.yaml

@@ -97,24 +97,6 @@ paths:
         '401':
           $ref: '#/components/responses/UnauthorizedApiKey'
 
-  /calendar/studies/{studyId}/calendar.ics:
-    get:
-      tags:
-        - calendar
-      description: Get study calendar for study as iCal
-      operationId: getStudyCalendar
-      parameters:
-        - $ref: '#/components/parameters/StudyId'
-      responses:
-        '200':
-          description: Successfully returned study calendar
-          content:
-            text/calendar:
-              schema:
-                type: string
-        '404':
-          description: Not found
-
 components:
   schemas:
     EndpointDataBulk: