Fix the bug: deploy key with write access can not push (#19010)

Use DeployKeyID to replace the IsDeployKey, then CanWriteCode uses the DeployKeyID to check the write permission.

modules/private/hook.go

@@ -56,7 +56,7 @@ type HookOptions struct {
 	GitQuarantinePath               string
 	GitPushOptions                  GitPushOptions
 	PullRequestID                   int64
-	IsDeployKey                     bool
+	DeployKeyID                     int64 // if the pusher is a DeployKey, then UserID is the repo's org user.
 	IsWiki                          bool
 }