Sweep failed for PR Fix: reintroducing Staging to Checking transition

[DIRACGridBot]

Sweep failed for PR Fix: reintroducing Staging to Checking transition
See #7122

[fstagni]

@michmx please add the content of this PR to #7121. Alternatively, which is maybe simpler, close #7121 then create a new correct PR targeting rel-v8r0.

[michmx]

@fstagni . OK, I will open a new PR. I have no permission to close #7121, could you help me with that?

[fstagni]

@fstagni . OK, I will open a new PR. I have no permission to close #7121, could you help me with that?

Done.