fix(testing): check if target exists before adding target for jest

[barbados-clemens]

Current Behavior

jest generator assumes there will be a target object when adding test target

Expected Behavior

jest generator defaults targets object before adding test target if it does not exist

Related Issue(s)

Fixes #17776

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 1, 2023 7:24pm

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✅ Successfully ran 7 targets

• linux nx affected --target=e2e --base=8c723380a7b93b680e692c1b5ec5be0b47d0832a --head=df1f19f021655d965fd6ee247427d1052a7c9d88 --parallel=1
• linux nx affected --target=test --base=8c723380a7b93b680e692c1b5ec5be0b47d0832a --head=df1f19f021655d965fd6ee247427d1052a7c9d88 --parallel=1
• linux nx affected --target=build --base=8c723380a7b93b680e692c1b5ec5be0b47d0832a --head=df1f19f021655d965fd6ee247427d1052a7c9d88 --parallel=3
• linux nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• linux nx affected --target=lint --base=8c723380a7b93b680e692c1b5ec5be0b47d0832a --head=df1f19f021655d965fd6ee247427d1052a7c9d88 --parallel=3
• nx-cloud record -- nx format:check --base=8c723380a7b93b680e692c1b5ec5be0b47d0832a --head=df1f19f021655d965fd6ee247427d1052a7c9d88
• linux nx documentation --no-dte

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