UPSTREAM_JOB_NUMBER and UPSTREAM_TEST_JOB_NUMBER missing causing NumberFormatException

[smlambert]

In certain cases, UPSTREAM_JOB_NUMBER and UPSTREAM_TEST_JOB_NUMBER do not get copied into rebuild parameters when rerun in Grinder. This culminates in Exception: java.lang.NumberFormatException: For input string: "".

Example: https://ci.adoptium.net/job/Grinder/8493/ which is a rerun in Grinder

This does not happen in all cases/paths, need to determine when this occurs and when does not.

[smlambert]

Example:
https://ci.adoptium.net/job/Test_openjdk21_hs_sanity.openjdk_x86-64_linux/155/ when trying to launch jdk_custom targets from that pipeline in https://ci.adoptium.net/job/Grinder/8538/, see same issue

[sophia-guo]

The failed testcase name includes #. All parameters after custom_target are cut. Need to use URLEncoder.