fix(core): module federation migration for project with no targets

[isaacplmann]

The add-mf-env-var-to-target-defaults migration was failing when there is a project with no targets.

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Feb 2, 2024 3:22pm

[nx-cloud]

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✅ Successfully ran 6 targets

• nx affected --target=e2e --base=a0ae902e4e624bdd6154fcf86db55efe1652a70d --head=8ba10f6f8558f49efaec5a190983dd19699f1c0a --parallel=1
• nx affected --targets=lint,test,build --base=a0ae902e4e624bdd6154fcf86db55efe1652a70d --head=8ba10f6f8558f49efaec5a190983dd19699f1c0a --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=a0ae902e4e624bdd6154fcf86db55efe1652a70d --head=8ba10f6f8558f49efaec5a190983dd19699f1c0a
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=a0ae902e4e624bdd6154fcf86db55efe1652a70d --head=8ba10f6f8558f49efaec5a190983dd19699f1c0a

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[github-actions]

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