Add gcov-based test pruning with coverage cache #4996

Job	Run time
Detect File Changes	12s
Lint Gate	1m 38s
Rebuild Coverage Cache	9m 26s
Github	1s
${{ matrix.cluster_name }} (${{ matrix.device }}${{ (((matrix.interface != 'none') && format('-{0}', matrix.interface)) \|\| '') }}${{ (((matrix.shard != '') && format(' [{0}]', matrix.shard)) \|\| '') }})	1s
	11m 18s

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