Handle user delete (#1113)

Implement user deletion across all IDP-ss. Expires all user peers
when the user is deleted. Users are permanently removed from a local
store, but in IDP, we remove Netbird attributes for the user
untilUserDeleteFromIDPEnabled setting is not enabled.

To test, an admin user should remove any additional users.

Until the UI incorporates this feature, use a curl DELETE request
targeting the /users/<USER_ID> management endpoint. Note that this
request only removes user attributes and doesn't trigger a delete
from the IDP.

To enable user removal from the IdP, set UserDeleteFromIDPEnabled
to true in account settings. Until we have a UI for this, make this
change directly in the store file.

Store the deleted email addresses in encrypted in activity store.

management/server/activity/event.go

@@ -18,10 +18,13 @@ type Event struct {
 	ID uint64
 	// InitiatorID is the ID of an object that initiated the event (e.g., a user)
 	InitiatorID string
+	// InitiatorEmail is the email address of an object that initiated the event. This will be set on deleted users only
+	InitiatorEmail string
 	// TargetID is the ID of an object that was effected by the event (e.g., a peer)
 	TargetID string
 	// AccountID is the ID of an account where the event happened
 	AccountID string
+
 	// Meta of the event, e.g. deleted peer information like name, IP, etc
 	Meta map[string]any
 }
@@ -35,12 +38,13 @@ func (e *Event) Copy() *Event {
 	}
 
 	return &Event{
-		Timestamp:   e.Timestamp,
-		Activity:    e.Activity,
-		ID:          e.ID,
-		InitiatorID: e.InitiatorID,
-		TargetID:    e.TargetID,
-		AccountID:   e.AccountID,
-		Meta:        meta,
+		Timestamp:      e.Timestamp,
+		Activity:       e.Activity,
+		ID:             e.ID,
+		InitiatorID:    e.InitiatorID,
+		InitiatorEmail: e.InitiatorEmail,
+		TargetID:       e.TargetID,
+		AccountID:      e.AccountID,
+		Meta:           meta,
 	}
 }