refactor: http request binding (#38971)

Better than before, still not good enough (more work can be done in the
future)

And add the missing error handling in the PrivateContext "bind"
middleware.

By the way, picked some "TrimSpace" changes from "fix: trim whitespace
from SMTP address and port - #38934" (fix #38926)

modules/validation/glob_pattern_test.go

@@ -7,8 +7,6 @@ import (
 	"testing"
 
 	"gitea.dev/modules/glob"
-
-	"gitea.com/go-chi/binding"
 )
 
 func getGlobPatternErrorString(pattern string) string {
@@ -21,29 +19,27 @@ func getGlobPatternErrorString(pattern string) string {
 }
 
 func Test_GlobPatternValidation(t *testing.T) {
-	AddBindingRules()
-
 	globValidationTestCases := []validationTestCase{
 		{
 			description: "Empty glob pattern",
-			data: TestForm{
+			data: &TestForm{
 				GlobPattern: "",
 			},
 		},
 		{
 			description: "Valid glob",
-			data: TestForm{
+			data: &TestForm{
 				GlobPattern: "{master,release*}",
 			},
 		},
 
 		{
 			description: "Invalid glob",
-			data: TestForm{
+			data: &TestForm{
 				GlobPattern: "[a-",
 			},
-			expectedErrors: binding.Errors{
-				binding.Error{
+			expectedErrors: BindingErrors{
+				BindingError{
 					FieldNames:     []string{"GlobPattern"},
 					Classification: ErrGlobPattern,
 					Message:        getGlobPatternErrorString("[a-"),