The new esbuild-based CI pipeline (core-ci) uses curated resource
patterns in build/next/index.ts to copy non-JS assets into the bundle
output. When built-in .prompt.md files were added for the sessions
window, they were included in the legacy pipeline's
vscodeResourceIncludes (build/gulpfile.vscode.ts) but not in the
desktopResourcePatterns used by the esbuild pipeline.
This caused the prompt files to be missing from release builds
(out-vscode-min), even though they worked correctly when running
from sources (where copyAllNonTsFiles copies everything).
Add 'vs/sessions/prompts/*.prompt.md' to desktopResourcePatterns
to match the existing entry in vscodeResourceIncludes.
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