Add tooltip to source list keys #1201

Job	Run time
Check & Compile	5m 40s
Build for macOS (x64)	1m 53s
Build for Windows (x64)	6m 49s
Build for Linux/AppImage (x64)	1m 56s
WPILib: Build for Linux (x64)	1m 40s
Build for macOS (arm64)	2m 7s
Build for Windows (arm64)	8m 14s
Build for Linux/AppImage (arm64)	2m 22s
WPILib: Build for Linux (arm64)	1m 26s
Build for Linux/AppImage (armv7l)	1m 44s
WPILib: Build for macOS (x64)	1m 55s
WPILib: Build for Windows (x64)	6m 8s
WPILib: Build for macOS (arm64)	2m 0s
WPILib: Build for Windows (arm64)	5m 48s
Finalize Release	0s
	49m 42s

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