Ensure jtrunner headless platforms run headless regardless of DISPLAY #6013
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Fixes adoptium/ci-jenkins-pipelines#1195
for headless alpine, riscv
Update jtrunner so for headless platforms as well as setting jck headless property it also ensures
the JVM graphical device & system is headless with -Djava.awt.headless=true
Default JVM behavior will not fully be headless if the test environment has DISPLAY set.
TC Test job: Test_openjdk21_hs_extended.jck_x86-64_alpine-linux/64 - ?