fix(core): use target_os = "linux" instead of just linux for watch events

[Cammisuli]

Current Behavior

We were using an incorrect cfg!(linux) macro to do some conditional compilation for linux.

Expected Behavior

Use the correct cfg!(target_os = "linux") macro argument.

Related Issue(s)

Fixes #20406

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Dec 1, 2023 6:25pm

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✅ Successfully ran 6 targets

• nx affected --target=e2e --base=5a47eaf684fa2a30b415cab2f0b7bbe06070efbe --head=05fb0d06d20953339c7de4fd0baf9c5d7d453e32 --parallel=1
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx affected --targets=lint,test,build --base=5a47eaf684fa2a30b415cab2f0b7bbe06070efbe --head=05fb0d06d20953339c7de4fd0baf9c5d7d453e32 --parallel=3
• nx-cloud record -- nx format:check --base=5a47eaf684fa2a30b415cab2f0b7bbe06070efbe --head=05fb0d06d20953339c7de4fd0baf9c5d7d453e32
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=5a47eaf684fa2a30b415cab2f0b7bbe06070efbe --head=05fb0d06d20953339c7de4fd0baf9c5d7d453e32

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