Align linux-riscv64 evaluation pipelines on jdk17u, jdk21u and jdk{latest} only

[luhenry]

Given the constrained resources, we want to make sure we trigger the evaluation pipelines only on the LTS and latest releases.

Relates to adoptium/temurin-build#3591

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[luhenry]

cc @sxa @smlambert could I please get a review? Thanks!