[#13498] Remove "archive courses" back-end logic

[TobyCyan]

Part of #13498

Outline of Solution

• Removed course archival from logic and entity classes.
• Removed archive field data migration class.
• Updated tests.

Fork #PR for CI proof.

Front-end Demo

TEAMMATES_PR_FRONTEND_DEMO.mp4

[Copilot]

Pull request overview

Removes the remaining back-end pieces of the “archive courses” feature (endpoint, request/output types, datastore persistence/logic, and related constants), aligning with the staged removal plan in #13498 after front-end disconnection.

Changes:

• Deleted the course-archival WebAPI endpoint (ArchiveCourseAction) and its request/output DTOs.
• Removed datastore-level isArchived handling from the Instructor entity and instructor retrieval/update logic.
• Updated affected WebAPI flows and tests to use the simplified instructor retrieval API and removed archived course status handling.

Reviewed changes

Copilot reviewed 23 out of 23 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/test/java/teammates/ui/webapi/GetActionClassesActionTest.java	Removes ArchiveCourseAction from the expected action class list.
src/test/java/teammates/ui/webapi/BinCourseActionTest.java	Updates instructor retrieval call signature in test.
src/test/java/teammates/storage/api/InstructorsDbTest.java	Updates tests for getInstructorsForGoogleId new signature.
src/test/java/teammates/sqlui/webapi/GetActionClassesActionTest.java	Removes ArchiveCourseAction import and expectation.
src/test/java/teammates/common/datatransfer/attributes/InstructorAttributesTest.java	Updates datastore Instructor constructor usage after removing isArchived.
src/main/java/teammates/ui/webapi/GetFeedbackSessionsAction.java	Uses simplified instructor retrieval (no archived filtering).
src/main/java/teammates/ui/webapi/GetCoursesAction.java	Removes archived course status branch and updates instructor retrieval accordingly.
src/main/java/teammates/ui/webapi/ArchiveCourseAction.java	Deletes the archive-course endpoint implementation.
src/main/java/teammates/ui/webapi/ActionFactory.java	Unmaps the course archive endpoint route.
src/main/java/teammates/ui/request/CourseArchiveRequest.java	Deletes request body type for course archival.
src/main/java/teammates/ui/output/CourseArchiveData.java	Deletes response DTO for course archival.
src/main/java/teammates/ui/constants/ResourceEndpoints.java	Removes COURSE_ARCHIVE endpoint enum entry.
src/main/java/teammates/storage/entity/Instructor.java	Removes datastore isArchived field and related accessors/constructor param.
src/main/java/teammates/storage/api/InstructorsDb.java	Removes archived filtering/support from instructor queries and updates.
src/main/java/teammates/sqllogic/core/FeedbackSessionsLogic.java	Updates Javadoc to remove archived-course omission mention.
src/main/java/teammates/sqllogic/api/Logic.java	Updates Javadoc to remove archived-course omission mention.
src/main/java/teammates/logic/core/InstructorsLogic.java	Removes archival setter and consolidates instructor retrieval API.
src/main/java/teammates/logic/core/FeedbackSessionsLogic.java	Updates Javadoc to remove archived-course omission mention.
src/main/java/teammates/logic/core/AccountsLogic.java	Updates instructor retrieval call signature.
src/main/java/teammates/logic/api/Logic.java	Removes archived-aware instructor retrieval overload and archive setter API.
src/main/java/teammates/common/util/Const.java	Removes archived course status and course archive URI constants.
src/main/java/teammates/common/datatransfer/attributes/InstructorAttributes.java	Removes isArchived from datastore instructor attributes and update options.
src/client/java/teammates/client/scripts/DataMigrationForInstructorNullIsArchivedField.java	Deletes obsolete migration script for isArchived null handling.

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[mingyuancode]

LGTM