[Bugfix][CI/Build][Hardware][AMD] Shard ID parameters in AMD tests running parallel jobs

[hissu-hyvarinen]

In the loop in run-amd-test.sh that runs parallel jobs, the replacement that assigns values to the shard-id argument only happens when there's a blank space after --shard-id==. When the variable commands is used for each loop iteration, the replacement is done only on the first round (as after that, there's a zero instead of a blank space), resulting to shard-id being zero for all 8 jobs. This PR fixes the issue by using a separate loop variable instead of overwriting commands.

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