Bus: Tests cleanup (#46025)

* Delete unused bus from usagestats

* Few updates to remove bus from searchusers test

* Fix import

pkg/services/sqlstore/mockstore/mockstore.go

@@ -30,6 +30,7 @@ type SQLStoreMock struct {
 	ExpectedDashboardSnapshot      *models.DashboardSnapshot
 	ExpectedTeamsByUser            []*models.TeamDTO
 	ExpectedSearchOrgList          []*models.OrgDTO
+	ExpectedSearchUsers            models.SearchUserQueryResult
 	ExpectedDatasources            []*models.DataSource
 	ExpectedOrg                    *models.Org
 	ExpectedSystemStats            *models.SystemStats
@@ -193,6 +194,11 @@ func (m *SQLStoreMock) GetSignedInUser(ctx context.Context, query *models.GetSig
 	return m.ExpectedError
 }
 
+func (m *SQLStoreMock) SearchUsers(ctx context.Context, query *models.SearchUsersQuery) error {
+	query.Result = m.ExpectedSearchUsers
+	return m.ExpectedError
+}
+
 func (m *SQLStoreMock) DisableUser(ctx context.Context, cmd *models.DisableUserCommand) error {
 	m.LatestUserId = cmd.UserId
 	return m.ExpectedError