fix(react): migrations should not crash when adding development configuration

[john-waitforit]

Current Behavior

Some project.json cannot be migrated automatically using the add-default-development-configurations script (when they don't contain the configurations key in a target)

Expected Behavior

The migration script should work smoothly for all targets!

Related Issue(s)

Fixes #10259

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✅ Successfully ran 12 targets

• nx affected --target=build --base=5251bd73acb5ac52d37b0795e26346b02dba24f7 --head=c8c63b43814a3b40d0f3659170a364a214f8ab5d --parallel=3
• nx affected --target=e2e --base=5251bd73acb5ac52d37b0795e26346b02dba24f7 --head=c8c63b43814a3b40d0f3659170a364a214f8ab5d --exclude=e2e-detox,e2e-js,e2e-next,e2e-workspace-create,e2e-workspace-integrations,e2e-workspace-core,e2e-react,e2e-web,e2e-angular-extensions,e2e-angular-core,e2e-cli,e2e-nx-plugin,e2e-cypress,e2e-node,e2e-linter,e2e-jest,e2e-a...
• nx affected --target=e2e --base=5251bd73acb5ac52d37b0795e26346b02dba24f7 --head=c8c63b43814a3b40d0f3659170a364a214f8ab5d --exclude=e2e-storybook,e2e-react-native,e2e-detox --parallel=1
• nx affected --target=lint --base=5251bd73acb5ac52d37b0795e26346b02dba24f7 --head=c8c63b43814a3b40d0f3659170a364a214f8ab5d --parallel=3
• nx affected --target=test --base=5251bd73acb5ac52d37b0795e26346b02dba24f7 --head=c8c63b43814a3b40d0f3659170a364a214f8ab5d --parallel=1
• nx build typedoc-theme
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn check-imports
• nx-cloud record -- yarn depcheck
• nx-cloud record -- yarn documentation
• nx-cloud record -- yarn nx format:check --base=5251bd73acb5ac52d37b0795e26346b02dba24f7 --head=c8c63b43814a3b40d0f3659170a364a214f8ab5d
• nx-cloud record -- yarn nx workspace-lint

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1 Ignored Deployment

Name	Status	Preview	Updated
nx-dev	⬜️ Ignored (Inspect)		May 12, 2022 at 0:11AM (UTC)

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