Enable aarch64_linux test parallel

[sophia-guo]

Related adoptium/infrastructure#2893 (comment)

Signed-off-by: Sophia Guo [email protected]

[github-actions]

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[sxa]

LGTM - Was initially set this way during the initial parallelism PR at #661 by the look of it, presumably because we were using a small number of very high spec systems so the parallel feature was not of any significant value.

This should get us most of the way to fixing adoptium/infrastructure#2893

@steelhead31 We should aim to get this in before running the release pipelines tomorrow.

[steelhead31]

@sophia-guo would you like to merge and cherry pick this into the release branch, or would you like me to take care of it?

[sophia-guo]

@steelhead31 #665 , thanks!