chore: use Linter directly from ESLint

Uses eslint's own `Linter` rather than the compat layer.

Author: 43081j

packages/eslint-plugin-svelte/tests/utils/eslint-compat.ts

@@ -1,9 +1,5 @@
-import { getLegacyESLint, getESLint } from 'eslint-compat-utils/eslint';
-import { getLinter } from 'eslint-compat-utils/linter';
-import { getRuleTester, getRuleIdPrefix } from 'eslint-compat-utils/rule-tester';
+import { getESLint } from 'eslint-compat-utils/eslint';
+import { getRuleTester } from 'eslint-compat-utils/rule-tester';
 
-export const LegacyESLint = getLegacyESLint();
 export const ESLint = getESLint();
 export const RuleTester = getRuleTester();
-export const TEST_RULE_ID_PREFIX = getRuleIdPrefix();
-export const Linter = getLinter();

packages/eslint-plugin-svelte/tests/utils/utils.ts

@@ -7,7 +7,7 @@ import { applyFixes } from './source-code-fixer.js';
 import { parse as parseYaml, stringify as stringifyYaml } from 'yaml';
 import semver from 'semver';
 import { writeAndFormat } from '../../tools/lib/write.js';
-import { Linter } from './eslint-compat.js';
+import { Linter } from 'eslint';
 import * as svelteParser from 'svelte-eslint-parser';
 import * as typescriptParser from '@typescript-eslint/parser';
 import Module from 'module';