Development: Migrate plagiarism submodule of courses module to signals inject and standalone

[xHadie]

Checklist

General

• I tested all changes and their related features with all corresponding user types on a test server.
• This is a small issue that I tested locally and was confirmed by another developer on a test server.
• Language: I followed the guidelines for inclusive, diversity-sensitive, and appreciative language.
• I chose a title conforming to the naming conventions for pull requests.

Client

• I strictly followed the client coding and design guidelines.

Motivation and Context

Description

Steps for Testing

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Review Progress

Code Review

• Code Review 1
• Code Review 2

Manual Tests

• Test 1
• Test 2

Test Coverage

Class/File	Line Coverage	Confirmation (assert/expect)
plagiarism-case-instructor-detail-view.component.ts	98%	✅
plagiarism-cases-instructor-view.component.ts	97%	✅
plagiarism-case-review.component.ts	0%	❌
plagiarism-case-verdict.component.ts	100%	✅
plagiarism-cases.service.ts	40%	✅
plagiarism-results.service.ts	0%	❌
plagiarism-case-student-detail-view.component.ts	95%	✅

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