Set JCK_GIT_REPO on Temurin remote jck trigger

[andrew-m-leonard]

Fixes #980

12:34:25  BUILD FAILED
12:34:25  /home/jenkins/workspace/Test_openjdk23_hs_sanity.jck_x86-64_linux/aqa-tests/TKG/scripts/build_test.xml:95: The following error occurred while executing this line:
12:34:25  /home/jenkins/workspace/Test_openjdk23_hs_sanity.jck_x86-64_linux/aqa-tests/jck/build.xml:294: env.JCK_GIT_REPO: ${env.JCK_GIT_REPO} was not correctly set for running JCK tests. If you do not want to compile JCK tests,       please use BUILD_LIST to include test folders you want to test.

Set JCK_GIT_REPO for remote temurin compliance server, so it knows repo to use.

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[steelhead31]

Looks ok.