[backend] Prevent sending or receiving friend requests between users who have blocked each other

[lim396]

• フレンドリクエストのテストにブロック関連のテストを追加しました。
• 自分がblockしているユーザーにフレンドリクエストを送れない、受け取れないように修正しました。
• 自分をblockしているユーザーのフレンドリクエストを受け取れないように修正しました。

[coderabbitai]

Walkthrough

The recent update introduces a mechanism to ensure users cannot interact in ways that would violate blocking relationships within a social platform. A new method, expectNotBlocking, has been added to the FriendRequestService to check for any blocking relationships before proceeding with friend-related operations. Additionally, the test suite has been expanded to cover scenarios involving blocked users, enhancing the robustness of user interactions and ensuring that blocked states are respected across various functionalities.

Changes

Files	Change Summaries
.../friend-request.service.ts	Added expectNotBlocking method to prevent operations between users in blocking relationships.
.../user.e2e-spec.ts	Enhanced test coverage for blocking scenarios, including handling of friend requests and blocked users.

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