Improve Keycloak event handling

Mainly handle better the difference in structure and data of user vs. admin events payloads.

More details on each commit.

assigned to @drumm

requested review from @drumm

unassigned @drumm

added 11 commits

• 9da7f29f...00194f83 - 7 commits from branch 7.x-3.x
• 12973623 - Handle logout related events from Keycloak
• 215ac201 - State the difference between KC user and admin events
• b43134a3 - Handle more cases on KC event processing
• 8617f4ac - Handle KC logout error event better

Compare with previous version

merged

This is all deployed now, thanks!