Allow users to set custom TKG repo and branch in test.getDependency

[llxia]

Recently, we removed outdated jtreg6.1 in TKG master. https://ci.adoptium.net/job/test.getDependency/ is hardcoded TKG/master which will not stage jtreg6.1 anymore. However, in our release branch, jtreg6.1 is still needed. It failed because of missing jtreg6.1 in test.getDependency.

We should allow users to set custom TKG repo and branch in test.getDependency job.

Related: internal issue

[llxia]

test.getDependency jobs in all 3 Jenkins are updated to set params as needed:
https://ci.adoptium.net/job/test.getDependency/
https://openj9-jenkins.osuosl.org/job/test.getDependency/
internal

[llxia]

Temporarily disabled https://ci.adoptium.net/job/test.getDependency/ so that we have jtreg6.1 archived in the job. Will reenable the job after the release (in a week).