Github CI workflow fix

[BOHEUS]

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[greptile-apps]

PR Summary

This PR enhances the CI demo check workflow with improvements to its triggering mechanisms and test command reliability.

• Added workflow_dispatch trigger in .github/workflows/ci-demo-check.yml to enable manual workflow runs
• Fixed test command by adding quotes around @demo-only grep pattern to prevent pattern matching issues
• Renamed workflow from "CI demo check" to "CI Demo check" for consistency

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[github-actions]

Thanks @BOHEUS for your contribution!
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