Add Geo repository renamed event log

Closes #2641

See merge request !2238

[EE] Improve & fix the performance bar UI and behavior

See merge request !2349

Fix Geo log cursor

Closes #2858

See merge request !2353

Namespace license checks for multiple assignees

Closes #2564

See merge request !1916

Slack application service

See merge request !2259

Signed-off-by: Rémy Coutable <remy@rymai.me>

Update Geo documentation to use PostgreSQL replication slots

Closes #1844

See merge request !2245

Don't use TestLicense.destroy! as it triggers License.block_changes? which will block funcionality unintentionally

They are confusing.

Only if the issuable allows multiple assignees the `/reassign` command
should be enabled.

While at it, put all EE-specific Quick Action in a separate file.

Also, port back the original CE specs of QuickActionsServices and put
the differences in a separate EE-only file.

Take over the original CE specs and put the EE-specific specs to a
separate file. The CE spec has `TestLicense.destroy!` to make EE act
like EE.