fix(core): handle .nxignore properly for the native hasher

[Cammisuli]

Current Behavior

Currently the native hasher only uses the first line of the .nxignore file, thus missing the rest of the ignores

Expected Behavior

The .nxignore file should be read entirely and all contents should be handled

Related Issue(s)

Fixes #15377

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Name	Status	Preview	Comments	Updated
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 3, 2023 at 1:10PM (UTC)

[Cammisuli]

For some reason, the add_ignore here only used the first item in the ignore file 🤨

[nx-cloud]

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✅ Successfully ran 8 targets

• nx run-many -t e2e-macos --parallel=1 --exclude=e2e-detox
• nx affected --target=e2e --base=a7738caa7024a147e871d34b393a2c05acca251c --head=c8730d5cfe505231956d79a34293d9f203cfbd83 --exclude=e2e-storybook,e2e-storybook-angular --parallel=1
• nx run-many -t root-lint check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx affected --target=build --base=a7738caa7024a147e871d34b393a2c05acca251c --head=c8730d5cfe505231956d79a34293d9f203cfbd83 --parallel=3
• nx affected --target=test --base=a7738caa7024a147e871d34b393a2c05acca251c --head=c8730d5cfe505231956d79a34293d9f203cfbd83 --parallel=1
• nx affected --target=lint --base=a7738caa7024a147e871d34b393a2c05acca251c --head=c8730d5cfe505231956d79a34293d9f203cfbd83 --parallel=3
• nx-cloud record -- nx format:check --base=a7738caa7024a147e871d34b393a2c05acca251c --head=c8730d5cfe505231956d79a34293d9f203cfbd83
• nx documentation --no-dte

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[github-actions]

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