fix(utils): use tsconfigRootDir as root dir when specified

[nathan-xiao1]

Currently, when options.parserOptions.project is specified, we set the filename to be path.join(process.cwd(), 'tests/fixtures/'). This can be problematic when we run the test from a higher-up parent directory as it will use that as the base directory and look for 'tests/fixtures/file.ts from there.

Instead, we should use options.parserOptions.tsconfigRootDir as the base directory when specified and resolve file.ts from there. This is similar to how @typescript-eslint does it: https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/utils/src/eslint-utils/rule-tester/RuleTester.ts#L122-L137

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✅ Successfully ran 7 targets

• Node v16.19.0 - nx run-many --target=integration-test --all --withRegistry
• Node v16.19.0 - nx run-many --target=test --all --parallel --codeCoverage
• Node v16.19.0 - nx run-many --target=build --all --parallel
• Node v16.19.0 - nx run-many --target=typecheck --all --parallel
• Node v16.19.0 - nx run-many --target=check-rule-docs --all --parallel
• Node v14.21.2 - nx run-many --target=test --all --parallel
• Node v14.21.2 - nx run-many --target=build --all --parallel

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[JamesHenry]

Thank you @nathan-xiao1!