Updating JCK references for jck17 to jck17a

[adamfarley]

Resolves #5748

[adamfarley]

May not be testable until the tck repo has changes as well. - Update: It turns out that this is not the case.

Working on that here: https://github.com/temurin-compliance/temurin-compliance/issues/601

Update: tck repo changes complete. PR here: https://github.com/temurin-compliance/temurin-compliance/pull/602

Testing: https://ci.eclipse.org/temurin-compliance/job/Grinder/4646/

[karianna]

Grinder failed...

[smlambert]

New Grinder launched at:
https://ci.eclipse.org/temurin-compliance/job/Grinder/4647
with different TARGET value that exists.

[adamfarley]

The new Grinder (with a valid target, good catch Shelley) has also failed.

Update: Ticket raised.

[adamfarley]

Changing title to WIP, as this change it not safe to merge until it has been tested, and it cannot be tested until this confidential Eclipse issue is resolved.

[adamfarley]

Tested as detailed in the TCK issue. Some unit test failures, but 99% of everything passed, and nothing seemed to have trouble finding the jck17a test material.

[adamfarley]

Thanks @karianna and @ShelleyLambert 🤓