cubicweb #3843614 [testlib] RepoAccess does not call the session_open hooks [validation pending]

prioritynormal
typebug
done in3.19.1
load0.500
load left0.000
closed by#6eb7f361fba0 [testlib] complete the RepoAccess object (closes #3843614)
patch[testlib] complete the RepoAccess object (closes #3843614) [folded][tests/hooks] use the new connection api [applied]