Support actions and reusable workflows from private repos (#32562)

Resolve https://gitea.com/gitea/act_runner/issues/102

This PR allows administrators of a private repository to specify some
collaborative owners. The repositories of collaborative owners will be
allowed to access this repository's actions and workflows.

Settings for private repos:


![image](https://github.com/user-attachments/assets/e591c877-f94d-48fb-82f3-3b051f21557e)

---

This PR also moves "Enable Actions" setting to `Actions > General` page

<img width="960" alt="image"
src="https://github.com/user-attachments/assets/49337ec2-afb1-4a67-8516-5c9ef0ce05d4"
/>

<img width="960" alt="image"
src="https://github.com/user-attachments/assets/f58ee6d5-17f9-4180-8760-a78e859f1c37"
/>

---------

Signed-off-by: Zettat123 <zettat123@gmail.com>
Co-authored-by: ChristopherHX <christopher.homberger@web.de>

models/user/search.go

@@ -6,6 +6,7 @@ package user
 import (
 	"context"
 	"fmt"
+	"slices"
 	"strings"
 
 	"code.gitea.io/gitea/models/db"
@@ -22,7 +23,7 @@ type SearchUserOptions struct {
 	db.ListOptions
 
 	Keyword       string
-	Type          UserType
+	Types         []UserType
 	UID           int64
 	LoginName     string // this option should be used only for admin user
 	SourceID      int64  // this option should be used only for admin user
@@ -43,16 +44,16 @@ type SearchUserOptions struct {
 
 func (opts *SearchUserOptions) toSearchQueryBase(ctx context.Context) *xorm.Session {
 	var cond builder.Cond
-	cond = builder.Eq{"type": opts.Type}
+	cond = builder.In("type", opts.Types)
 	if opts.IncludeReserved {
-		switch opts.Type {
-		case UserTypeIndividual:
+		switch {
+		case slices.Contains(opts.Types, UserTypeIndividual):
 			cond = cond.Or(builder.Eq{"type": UserTypeUserReserved}).Or(
 				builder.Eq{"type": UserTypeBot},
 			).Or(
 				builder.Eq{"type": UserTypeRemoteUser},
 			)
-		case UserTypeOrganization:
+		case slices.Contains(opts.Types, UserTypeOrganization):
 			cond = cond.Or(builder.Eq{"type": UserTypeOrganizationReserved})
 		}
 	}