CodeRabbit Generated Unit Tests: Add unit tests for federation SDK services and homeserver module

[coderabbitai]

Unit test generation was requested by @rodrigok.

• refactor: adds authentication to media features #184 (comment)

The following files were modified:

• packages/federation-sdk/src/index.spec.ts
• packages/federation-sdk/src/services/federation-request.service.spec.ts
• packages/federation-sdk/src/services/media.service.spec.ts
• packages/federation-sdk/src/services/staging-area.service.spec.ts
• packages/homeserver/src/__tests__/homeserver.module.test.ts

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