style: Rename SqlExpression to SQLExpression

Renames the `SqlExpression` struct to `SQLExpression` to conform to Go's linting standards for acronyms.

- Updates the struct definition in `auth/user_mgt.go`.
- Updates all usages of the struct in `auth/user_mgt.go` and `auth/user_mgt_test.go`.

Author: google-labs-jules[bot]

auth/user_mgt.go

@@ -849,8 +849,8 @@ type queryUsersResponse struct {
 	Count string               `json:"recordsCount,omitempty"`
 }
 
-// SqlExpression is a query condition used to filter results.
-type SqlExpression struct {
+// SQLExpression is a query condition used to filter results.
+type SQLExpression struct {
 	Email       string `json:"email,omitempty"`
 	UserID      string `json:"userId,omitempty"`
 	PhoneNumber string `json:"phoneNumber,omitempty"`
@@ -864,7 +864,7 @@ type QueryUsersRequest struct {
 	SortBy         string           `json:"sortBy,omitempty"`
 	Order          string           `json:"order,omitempty"`
 	TenantID       string           `json:"tenantId,omitempty"`
-	Expression     []*SqlExpression `json:"expression,omitempty"`
+	Expression     []*SQLExpression `json:"expression,omitempty"`
 }
 
 // SortByField is a field to use for sorting user accounts.

auth/user_mgt_test.go

@@ -1947,7 +1947,7 @@ func TestQueryUsers(t *testing.T) {
 		Limit:          "1",
 		SortBy:         string(UserEmail),
 		Order:          string(Asc),
-		Expression: []*SqlExpression{
+		Expression: []*SQLExpression{
 			{
 				Email: "[email protected]",
 			},
@@ -1992,7 +1992,7 @@ func TestQueryUsersError(t *testing.T) {
 		Limit:          "1",
 		SortBy:         "USER_EMAIL",
 		Order:          "ASC",
-		Expression: []*SqlExpression{
+		Expression: []*SQLExpression{
 			{
 				Email: "[email protected]",
 			},