[TESTS] createUser via the user model helper for integration tests

(cherry picked from commit c1d14c5fff)
(cherry picked from commit e0e8aabc98)
(cherry picked from commit 392a415070)
(cherry picked from commit c7cf1307ca)
(cherry picked from commit 93b13d092b)

[TESTS] createUser via the user model helper for integration tests (squash)

(cherry picked from commit 6ff2383952)
(cherry picked from commit de2a6fe8c3)
(cherry picked from commit 398a6ab072)
(cherry picked from commit 16abc89780)
(cherry picked from commit 312a3ec5d9)
(cherry picked from commit 85c6d8e290)
(cherry picked from commit 79150d30a4)
(cherry picked from commit 436137962d)
(cherry picked from commit e4eb8d471e)
(cherry picked from commit a7257052f4)
(cherry picked from commit d5eba9a6dd)
(cherry picked from commit d89ef2ffa9)
(cherry picked from commit f1d25aa307)
(cherry picked from commit 60c7c07353)
(cherry picked from commit cfeff3afdb)
(cherry picked from commit 608ac6bd68)
(cherry picked from commit c64e530a13)
(cherry picked from commit 513db02971)
(cherry picked from commit 43eaaa5a61)
(cherry picked from commit 678eb49440)
(cherry picked from commit f7458dabda)
(cherry picked from commit 32568e43b4)

tests/integration/integration_test.go

@@ -23,7 +23,9 @@ import (
 	"time"
 
 	"code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
 	gitea_context "code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/graceful"
 	"code.gitea.io/gitea/modules/json"
@@ -33,6 +35,7 @@ import (
 	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/routers"
+	user_service "code.gitea.io/gitea/services/user"
 	"code.gitea.io/gitea/tests"
 
 	"github.com/PuerkitoBio/goquery"
@@ -228,6 +231,22 @@ func getUserToken(t testing.TB, userName string, scope ...auth.AccessTokenScope)
 	return getTokenForLoggedInUser(t, loginUser(t, userName), scope...)
 }
 
+func createUser(ctx context.Context, t testing.TB, user *user_model.User) func() {
+	user.MustChangePassword = false
+	user.LowerName = strings.ToLower(user.Name)
+
+	assert.NoError(t, db.Insert(ctx, user))
+
+	if len(user.Email) > 0 {
+		changePrimaryEmail := true
+		assert.NoError(t, user_model.UpdateUser(ctx, user, changePrimaryEmail))
+	}
+
+	return func() {
+		assert.NoError(t, user_service.DeleteUser(ctx, user, true))
+	}
+}
+
 func loginUser(t testing.TB, userName string) *TestSession {
 	t.Helper()