Fix main build: remove dangling Tool.Execution reference in BuildLegacyWireProtocolTool #2970

Job	Run time
build (ubuntu-latest, Release)	11m 48s
build (macos-latest, Debug)	11m 6s
build (ubuntu-latest, Debug)	9m 20s
build (windows-latest, Debug)	16m 18s
build (windows-latest, Release)	18m 43s
build (macos-latest, Release)	10m 48s
publish-coverage	-1s
	1h 18m 2s

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