fix(core): gitlab should be included in ci-workflow ci schema

[StalkAltan]

Current Behavior

Passing --ci=gitlab fails due to gitlab not existing in the generator schema

Expected Behavior

Gitlab CI should be generated

Fixes #14632

[vercel]

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Name	Status	Preview	Comments	Updated
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Jan 26, 2023 at 10:12PM (UTC)

[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=d5332b4e231cf659824830f16d2e4260ef45f4bb --head=a5cbc87c9045b44f2f723c693f2690708bdde6da --exclude=e2e-storybook,e2e-storybook-angular --parallel=1
• nx affected --target=test --base=d5332b4e231cf659824830f16d2e4260ef45f4bb --head=a5cbc87c9045b44f2f723c693f2690708bdde6da --parallel=1
• nx affected --target=build --base=d5332b4e231cf659824830f16d2e4260ef45f4bb --head=a5cbc87c9045b44f2f723c693f2690708bdde6da --parallel=3
• nx affected --target=lint --base=d5332b4e231cf659824830f16d2e4260ef45f4bb --head=a5cbc87c9045b44f2f723c693f2690708bdde6da --parallel=3
• nx run-many -t root-lint check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=d5332b4e231cf659824830f16d2e4260ef45f4bb --head=a5cbc87c9045b44f2f723c693f2690708bdde6da
• nx documentation --no-dte

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[github-actions]

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