fix(linter): fixes usages of lintProjectGenerator without eslintFilePatterns provided

[jbean96]

Previous change broke usages of the lintProjectGenerator which did not include an eslintFilePatterns array option. This resolves by first checking for the arrays existence before pushing to it

closed #18740

Related Issue(s)

Fixes #18740

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✅ Successfully ran 8 targets

• linux nx affected --target=e2e --base=2638bb0db2839051c7b661a56199dccf5ee96086 --head=3a8583385b04e7d284c966c9628bffbbb4240727 --parallel=1
• linux nx affected --target=test --base=2638bb0db2839051c7b661a56199dccf5ee96086 --head=3a8583385b04e7d284c966c9628bffbbb4240727 --parallel=1
• linux nx affected --target=build --base=2638bb0db2839051c7b661a56199dccf5ee96086 --head=3a8583385b04e7d284c966c9628bffbbb4240727 --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=2638bb0db2839051c7b661a56199dccf5ee96086 --head=3a8583385b04e7d284c966c9628bffbbb4240727 --parallel=3
• nx-cloud record -- nx format:check --base=2638bb0db2839051c7b661a56199dccf5ee96086 --head=3a8583385b04e7d284c966c9628bffbbb4240727
• linux nx documentation --no-dte
• macos nx affected -t e2e-macos --parallel=1 --base=2638bb0db2839051c7b661a56199dccf5ee96086 --head=3a8583385b04e7d284c966c9628bffbbb4240727

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[meeroslav]

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We do not guarantee there won't be any breaking changes in the future.

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