track external test sha

[sophia-guo]

External test has test.properties files, which set github repo url and tag_versions. As #5818 moves sha collecting as part of make target shaInfo, this can be implemented in getSHAs() in [getSHAs.sh] (url)

[sophia-guo]

External test dynamically generate the Dockerfile, getSHAs() can check if there is Dockefile generated ( will run tests) check test.properties to get the sha infor.

Edit: Checking generated Dockefile* may not be necessary at all. if test is running can just checking JVM_TEST_ROOT for those information.

[sophia-guo]

PR https://github.com/sophia-guo/TKG/blob/resutls2/scripts/getSHAs.sh#L81-L101 depends on #5818.

Grinder https://ci.adoptium.net/view/Test_grinder/job/Grinder/12080/ - running