MLBEDSW-10244: Update HLCS source ID key to track via scheduler operations

The existing mechanism that maps input operation to
output command skips over the scheduler operation,
connecting optimised graph ops to NPU commands.

 - This commit changes the source mapping to map via
   the scheduler operation that generated the HLCS
   operation, instead of skipping straight to the graph
   operation.
 - Fix alignment warning using deprecated std::aligned_storage

Signed-off-by: Philip Hall <philip.hall@arm.com>
Change-Id: Idbdb9da8aede418bc7e8c00ef0f0c11de34dde44