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
 }
 

modules/private/serv.go

@@ -46,9 +46,9 @@ func ServNoCommand(ctx context.Context, keyID int64) (*asymkey_model.PublicKey,
 // ServCommandResults are the results of a call to the private route serv
 type ServCommandResults struct {
 	IsWiki      bool
-	IsDeployKey bool
-	KeyID       int64
-	KeyName     string
+	DeployKeyID int64
+	KeyID       int64  // public key
+	KeyName     string // this field is ambiguous, it can be the name of DeployKey, or the name of the PublicKey
 	UserName    string
 	UserEmail   string
 	UserID      int64