Tweak the file-based MCP server sample #1274

Job	Run time
build (ubuntu-latest, Release)	5m 7s
build (macos-latest, Release)	5m 39s
build (windows-latest, Release)	8m 20s
build (ubuntu-latest, Debug)	5m 38s
build (macos-latest, Debug)	6m 47s
build (windows-latest, Debug)	10m 10s
publish-coverage / publish-coverage	57s
	42m 38s

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