[MM-32281] SqlRoleStore/GetByName: add context to allow read from master (#17176)

* role_store/GetByName: add context

* propagate context in the app layer

* propagate context in the app layer

* add missing import

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/team.go

@@ -385,7 +385,7 @@ func (a *App) UpdateTeamMemberRoles(teamID string, userID string, newRoles strin
 
 	for _, roleName := range strings.Fields(newRoles) {
 		var role *model.Role
-		role, err = a.GetRoleByName(roleName)
+		role, err = a.GetRoleByName(context.Background(), roleName)
 		if err != nil {
 			err.StatusCode = http.StatusBadRequest
 			return nil, err