fix(testing): warn and default if sourceRoot isn't set for ng CT

[barbados-clemens]

Current Behavior

when sourceRoot is missing in the project.json angular CT errors out trying to join the paths

Expected Behavior

does not error or provides helpful error

Related Issue(s)

Fixes #13883

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1 Ignored Deployment

Name	Status	Preview	Updated
nx-dev	⬜️ Ignored (Inspect)		Dec 21, 2022 at 5:37PM (UTC)

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✅ Successfully ran 11 targets

• nx affected --target=e2e --base=ae8e0280fd2b808665e6430b9119768b711a2915 --head=00fecffe8984bb4afaf18dfff0a0917be3b85d6c --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox --parallel=1
• nx affected --target=test --base=ae8e0280fd2b808665e6430b9119768b711a2915 --head=00fecffe8984bb4afaf18dfff0a0917be3b85d6c --parallel=1
• nx depcheck --no-dte
• nx affected --target=build --base=ae8e0280fd2b808665e6430b9119768b711a2915 --head=00fecffe8984bb4afaf18dfff0a0917be3b85d6c --parallel=3
• nx affected --target=lint --base=ae8e0280fd2b808665e6430b9119768b711a2915 --head=00fecffe8984bb4afaf18dfff0a0917be3b85d6c --parallel=3
• nx lint --no-dte
• nx check-lock-files --no-dte
• nx check-commit --no-dte
• nx-cloud record -- nx format:check --base=ae8e0280fd2b808665e6430b9119768b711a2915 --head=00fecffe8984bb4afaf18dfff0a0917be3b85d6c
• nx check-imports --no-dte
• nx documentation --no-dte

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[Coly010]

LGTM! I left a minor comment about the warning

[github-actions]

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