refactor: move metronome sampledata into separate translation unit #3675

Job	Run time
Ubuntu 22.04 (gcc)	8m 57s
Ubuntu 22.04 (Qt 6.2, gcc)	12m 7s
macOS 12 x64	27m 51s
macOS 12 arm64	22m 28s
Windows 2019 (MSVC)	16m 42s
Update manifest file on download server	34s
	1h 28m 39s

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