fix(testing): make sure new tsconfig exists before adding ref

[barbados-clemens]

Current Behavior

nx/cypress v16.2.0 migration might add a project reference to a tsconfig file that doesn't exist

Expected Behavior

migration does not add references to files that don't exist

Related Issue(s)

Fixes #17120

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 24, 2023 7:07pm

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✅ Successfully ran 7 targets

• nx affected --target=e2e --base=56c7d38f0f478aaf8cce591ed61a0b120b820b94 --head=111eb81c602da579bc5c875db97db5c4011e4986 --parallel=1
• nx affected --target=test --base=56c7d38f0f478aaf8cce591ed61a0b120b820b94 --head=111eb81c602da579bc5c875db97db5c4011e4986 --parallel=1
• nx affected --target=build --base=56c7d38f0f478aaf8cce591ed61a0b120b820b94 --head=111eb81c602da579bc5c875db97db5c4011e4986 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files depcheck check-codeowners --parallel=1 --no-dte
• nx affected --target=lint --base=56c7d38f0f478aaf8cce591ed61a0b120b820b94 --head=111eb81c602da579bc5c875db97db5c4011e4986 --parallel=3
• nx-cloud record -- nx format:check --base=56c7d38f0f478aaf8cce591ed61a0b120b820b94 --head=111eb81c602da579bc5c875db97db5c4011e4986
• nx affected -t e2e-macos --parallel=1 --base=56c7d38f0f478aaf8cce591ed61a0b120b820b94 --head=111eb81c602da579bc5c875db97db5c4011e4986

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[github-actions]

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