AuthN: Cleanup authn package (#63456)

* AuthN: Update comments for ClientParams

* AuthN: Update flag name from SyncTeamMembers to SyncTeams

* UserSync: rename function and fix order of parameters so it is correct

* UserSync: Fix so we skip check if no authModule or authID is passed

* UserSync: move quota check to create user function

* UserSync: Move FetchSyncedUserHook to UserSync

* UserSync: Move last seen user hook to user sync service

* ApiKey: Implement last seen hook as a client hook instead

pkg/services/authn/authnimpl/sync/oauth_token_sync_test.go

@@ -17,7 +17,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/user"
 )
 
-func TestOauthTokenSync_SyncOauthToken(t *testing.T) {
+func TestOauthTokenSync_SyncOauthTokenHook(t *testing.T) {
 	type testCase struct {
 		desc     string
 		identity *authn.Identity
@@ -123,7 +123,7 @@ func TestOauthTokenSync_SyncOauthToken(t *testing.T) {
 				sessionService: sessionService,
 			}
 
-			err := sync.SyncOauthToken(context.Background(), tt.identity, nil)
+			err := sync.SyncOauthTokenHook(context.Background(), tt.identity, nil)
 			assert.ErrorIs(t, err, tt.expectedErr)
 			assert.Equal(t, tt.expectHasEntryCalled, hasEntryCalled)
 			assert.Equal(t, tt.expectTryRefreshTokenCalled, tryRefreshCalled)