getDependentLibs should fail if the download step fails

[llxia]

Currently, the test script proceeds even if the download step fails in getDependentLibs.

     [exec] --------------------------------------------
     [exec] Starting download third party dependent jars
     [exec] --------------------------------------------
     [exec] downloading dependent third party jars to /home/runner/work/aqa-tests/aqa-tests/openjdk-tests/TKG/../TKG/lib
     [exec] downloading https://ci.eclipse.org/openj9/view/Infrastructure/job/Build_JDK_Timeout_Handler/lastSuccessfulBuild/artifact/openj9jtregtimeouthandler.jar.sha256sum.txt
     [exec] --> file downloaded to /home/runner/work/aqa-tests/aqa-tests/openjdk-tests/TKG/../TKG/lib/openj9jtregtimeouthandler.jar.sha256sum.txt
     [exec] downloading https://ci.eclipse.org/openj9/view/Infrastructure/job/Build_JDK_Timeout_Handler/lastSuccessfulBuild/artifact/openj9jtregtimeouthandler.jar
     [exec] --> file downloaded to /home/runner/work/aqa-tests/aqa-tests/openjdk-tests/TKG/../TKG/lib/openj9jtregtimeouthandler.jar
     [exec] downloading https://ci.eclipse.org/openj9/view/Infrastructure/job/Build_JDK_Timeout_Handler/lastSuccessfulBuild/artifact/openj9jtregtimeouthandler.jar.sha256sum.txt
     [exec] --> file downloaded to /home/runner/work/aqa-tests/aqa-tests/openjdk-tests/TKG/../TKG/lib/openj9jtregtimeouthandler.jar.sha256sum.txt
     [exec] Expected sha is: <!doctype,
     [exec] Actual sha is  : d46d58c000b511cd0fde4eb331fb09810511709ab0107974bb6148c583a3c2ff.
     [exec] ERROR: sha checksum error.
     [exec] Please delete /home/runner/work/aqa-tests/aqa-tests/openjdk-tests/TKG/../TKG/lib/openj9jtregtimeouthandler.jar and rerun the program!
     [exec] Result: 255
getJtreg:
    [mkdir] Created dir: /home/runner/work/aqa-tests/aqa-tests/jvmtest/openjdk
     [exec] gzip: jtreg_4_2_0_tip.tar.gz: No such file or directory

getDependentLibs should be updated.

TKG/scripts/getDependencies.xml

Line 26 in 0717152

<target name="getDependentLibs" unless="skipDependency">