fix(testing): do not add a duplicate tsconfig.spec.json ref

[vicb]

Current Behavior

Jest could add a duplicate ref to the spec file in tsconfig.json

See #14167 (comment)

Expected Behavior

Jest could not add a duplicate ref to the spec file in tsconfig.json

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Name	Status	Preview	Updated
nx-dev	✅ Ready (Inspect)	Visit Preview	Jan 6, 2023 at 6:39PM (UTC)

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✅ Successfully ran 11 targets

• nx affected --target=e2e --base=13d885a02d9cf07e7a0bb46b00df4306f695c003 --head=542757a5ece4027c980a4232d10a3c959bb6455d --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox --parallel=1
• nx affected --target=test --base=13d885a02d9cf07e7a0bb46b00df4306f695c003 --head=542757a5ece4027c980a4232d10a3c959bb6455d --parallel=1
• nx affected --target=build --base=13d885a02d9cf07e7a0bb46b00df4306f695c003 --head=542757a5ece4027c980a4232d10a3c959bb6455d --parallel=3
• nx depcheck --no-dte
• nx affected --target=lint --base=13d885a02d9cf07e7a0bb46b00df4306f695c003 --head=542757a5ece4027c980a4232d10a3c959bb6455d --parallel=3
• nx lint --no-dte
• nx check-lock-files --no-dte
• nx check-commit --no-dte
• nx-cloud record -- nx format:check --base=13d885a02d9cf07e7a0bb46b00df4306f695c003 --head=542757a5ece4027c980a4232d10a3c959bb6455d
• nx check-imports --no-dte
• nx documentation --no-dte

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[vicb]

Thanks!

[github-actions]

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