refactor: migrate to typeorm 3.0 (#8443)

* wip

* wip

* wip

* Update following.ts

* wip

* wip

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* Update resolve-user.ts

* maxQueryExecutionTime

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* wip

packages/backend/src/misc/reaction-lib.ts

@@ -3,6 +3,7 @@ import { emojiRegex } from './emoji-regex.js';
 import { fetchMeta } from './fetch-meta.js';
 import { Emojis } from '@/models/index.js';
 import { toPunyNullable } from './convert-host.js';
+import { IsNull } from 'typeorm';
 
 const legacies: Record<string, string> = {
 	'like':     '👍',
@@ -74,8 +75,8 @@ export async function toDbReaction(reaction?: string | null, reacterHost?: strin
 	const custom = reaction.match(/^:([\w+-]+)(?:@\.)?:$/);
 	if (custom) {
 		const name = custom[1];
-		const emoji = await Emojis.findOne({
-			host: reacterHost || null,
+		const emoji = await Emojis.findOneBy({
+			host: reacterHost ?? IsNull(),
 			name,
 		});