Move context from modules to services (#29440)

Since `modules/context` has to depend on `models` and many other
packages, it should be moved from `modules/context` to
`services/context` according to design principles. There is no logic
code change on this PR, only move packages.

- Move `code.gitea.io/gitea/modules/context` to
`code.gitea.io/gitea/services/context`
- Move `code.gitea.io/gitea/modules/contexttest` to
`code.gitea.io/gitea/services/contexttest` because of depending on
context
- Move `code.gitea.io/gitea/modules/upload` to
`code.gitea.io/gitea/services/context/upload` because of depending on
context

routers/api/packages/api.go

@@ -10,7 +10,6 @@ import (
 
 	auth_model "code.gitea.io/gitea/models/auth"
 	"code.gitea.io/gitea/models/perm"
-	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/web"
@@ -36,7 +35,7 @@ import (
 	"code.gitea.io/gitea/routers/api/packages/swift"
 	"code.gitea.io/gitea/routers/api/packages/vagrant"
 	"code.gitea.io/gitea/services/auth"
-	context_service "code.gitea.io/gitea/services/context"
+	"code.gitea.io/gitea/services/context"
 )
 
 func reqPackageAccess(accessMode perm.AccessMode) func(ctx *context.Context) {
@@ -642,7 +641,7 @@ func CommonRoutes() *web.Route {
 				})
 			})
 		}, reqPackageAccess(perm.AccessModeRead))
-	}, context_service.UserAssignmentWeb(), context.PackageAssignment())
+	}, context.UserAssignmentWeb(), context.PackageAssignment())
 
 	return r
 }
@@ -812,7 +811,7 @@ func ContainerRoutes() *web.Route {
 
 			ctx.Status(http.StatusNotFound)
 		})
-	}, container.ReqContainerAccess, context_service.UserAssignmentWeb(), context.PackageAssignment(), reqPackageAccess(perm.AccessModeRead))
+	}, container.ReqContainerAccess, context.UserAssignmentWeb(), context.PackageAssignment(), reqPackageAccess(perm.AccessModeRead))
 
 	return r
 }