enhance(backend): refine system account (#15530)

* wip

* wip

* wip

* Update SystemAccountService.ts

* Update 1740121393164-system-accounts.js

* Update DeleteAccountService.ts

* wip

* wip

* wip

* wip

* Update 1740121393164-system-accounts.js

* Update RepositoryModule.ts

* wip

* wip

* wip

* Update ApRendererService.ts

* wip

* wip

* Update SystemAccountService.ts

* fix tests

* fix tests

* fix tests

* fix tests

* fix tests

* fix tests

* add print logs

* ログが長すぎて出てないかもしれない

* fix migration

* refactor

* fix fed-tests

* Update RelayService.ts

* merge

* Update user.test.ts

* chore: emit log

* fix: tweak sleep duration

* fix: exit 1

* fix: wait for misskey processes to become healthy

* fix: longer sleep for user deletion

* fix: make sleep longer again

* デッドロック解消の試み

https://github.com/misskey-dev/misskey/issues/15005

* Revert "デッドロック解消の試み"

This reverts commit 266141f66f.

* wip

* Update SystemAccountService.ts

---------

Co-authored-by: おさむのひと <46447427+samunohito@users.noreply.github.com>
Co-authored-by: zyoshoka <107108195+zyoshoka@users.noreply.github.com>

packages/backend/test-federation/test/user.test.ts

@@ -37,6 +37,7 @@ describe('User', () => {
 					'id',
 					'host',
 					'avatarUrl',
+					'avatarBlurhash',
 					'instance',
 					'badgeRoles',
 					'url',
@@ -379,7 +380,8 @@ describe('User', () => {
 				strictEqual(followers.length, 1); // followed by Bob
 
 				await alice.client.request('i/delete-account', { password: alice.password });
-				await sleep();
+				// NOTE: user deletion query is slow
+				await sleep(4000);
 
 				const following = await bob.client.request('users/following', { userId: bob.id });
 				strictEqual(following.length, 0); // no following relation
@@ -477,7 +479,8 @@ describe('User', () => {
 				strictEqual(followers.length, 1); // followed by Bob
 
 				await aAdmin.client.request('admin/suspend-user', { userId: alice.id });
-				await sleep();
+				// NOTE: user deletion query is slow
+				await sleep(4000);
 
 				const following = await bob.client.request('users/following', { userId: bob.id });
 				strictEqual(following.length, 0); // no following relation