java.mx.project tests are failing due to missing branches/tags

[mbien]

-checkout-graalvm:
     [exec] Cloning into 'graal'...
     [exec] Note: switching to '2a0af49b3c8dfcc255992d3096aec02a81874c68'.
     [exec] 
     [exec] You are in 'detached HEAD' state. You can look around, make experimental
     [exec] changes and commit them, and you can discard any commits you make in this
     [exec] state without impacting any branches by switching back to a branch.
     [exec] 
     [exec] If you want to create a new branch to retain commits you create, you may
     [exec] do so (now or later) by using -c with the switch command. Example:
     [exec] 
     [exec]   git switch -c <new-branch-name>
     [exec] 
     [exec] Or undo this operation with:
     [exec] 
     [exec]   git switch -
     [exec] 
     [exec] Turn off this advice by setting config variable advice.detachedHead to false
     [exec] 
     [exec] Updating files:  89% (12679/14163)
     [exec] Updating files:  90% (12747/14163)Updating files:  91% (12889/14163)Updating files:  92% (13030/14163)Updating files:  93% (13172/14163)Updating files:  94% (13314/14163)Updating files:  95% (13455/14163)Updating files:  96% (13597/14163)Updating files:  97% (13739/14163)Updating files:  98% (13880/14163)Updating files:  99% (14022/14163)Updating files: 100% (14163/14163)Updating files: 100% (14163/14163), done.
     [exec] Cloning into 'mx'...
     [exec] warning: Could not find remote branch 6.7.0 to clone.
     [exec] fatal: Remote branch 6.7.0 not found in upstream origin

BUILD FAILED

#7471 disabled the tests until they are repaired

something similar happened before: #5196