Fix container jobs: use relative paths for artifact upload #360

Job	Run time
identifiers / Build GitHub identifiers	12s
identifiers / Log resolved identifiers	2s
WebSocket Server Testing (All Combinations)	4m 55s
WebSocket Client Testing (All Combinations)	9m 15s
Consolidate WebSocket Reports	3m 24s
Verify WebSocket Conformance (100% Pass Required)	3m 23s
	21m 11s

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