Use the type RefName for all the needed places and fix pull mirror sync bugs (#24634)

This PR replaces all string refName as a type `git.RefName` to make the
code more maintainable.

Fix #15367
Replaces #23070 
It also fixed a bug that tags are not sync because `git remote --prune
origin` will not remove local tags if remote removed.

We in fact should use `git fetch --prune --tags origin` but not `git
remote update origin` to do the sync.

Some answer from ChatGPT as ref.

> If the git fetch --prune --tags command is not working as expected,
there could be a few reasons why. Here are a few things to check:
> 
>Make sure that you have the latest version of Git installed on your
system. You can check the version by running git --version in your
terminal. If you have an outdated version, try updating Git and see if
that resolves the issue.
> 
>Check that your Git repository is properly configured to track the
remote repository's tags. You can check this by running git config
--get-all remote.origin.fetch and verifying that it includes
+refs/tags/*:refs/tags/*. If it does not, you can add it by running git
config --add remote.origin.fetch "+refs/tags/*:refs/tags/*".
> 
>Verify that the tags you are trying to prune actually exist on the
remote repository. You can do this by running git ls-remote --tags
origin to list all the tags on the remote repository.
> 
>Check if any local tags have been created that match the names of tags
on the remote repository. If so, these local tags may be preventing the
git fetch --prune --tags command from working properly. You can delete
local tags using the git tag -d command.

---------

Co-authored-by: delvh <dev.lh@web.de>

modules/repository/push.go

@@ -4,8 +4,6 @@
 package repository
 
 import (
-	"strings"
-
 	"code.gitea.io/gitea/modules/git"
 )
 
@@ -15,7 +13,7 @@ type PushUpdateOptions struct {
 	PusherName   string
 	RepoUserName string
 	RepoName     string
-	RefFullName  string // branch, tag or other name to push
+	RefFullName  git.RefName // branch, tag or other name to push
 	OldCommitID  string
 	NewCommitID  string
 }
@@ -35,59 +33,34 @@ func (opts *PushUpdateOptions) IsUpdateRef() bool {
 	return !opts.IsNewRef() && !opts.IsDelRef()
 }
 
-// IsTag return true if it's an operation to a tag
-func (opts *PushUpdateOptions) IsTag() bool {
-	return strings.HasPrefix(opts.RefFullName, git.TagPrefix)
-}
-
 // IsNewTag return true if it's a creation to a tag
 func (opts *PushUpdateOptions) IsNewTag() bool {
-	return opts.IsTag() && opts.IsNewRef()
+	return opts.RefFullName.IsTag() && opts.IsNewRef()
 }
 
 // IsDelTag return true if it's a deletion to a tag
 func (opts *PushUpdateOptions) IsDelTag() bool {
-	return opts.IsTag() && opts.IsDelRef()
-}
-
-// IsBranch return true if it's a push to branch
-func (opts *PushUpdateOptions) IsBranch() bool {
-	return strings.HasPrefix(opts.RefFullName, git.BranchPrefix)
+	return opts.RefFullName.IsTag() && opts.IsDelRef()
 }
 
 // IsNewBranch return true if it's the first-time push to a branch
 func (opts *PushUpdateOptions) IsNewBranch() bool {
-	return opts.IsBranch() && opts.IsNewRef()
+	return opts.RefFullName.IsBranch() && opts.IsNewRef()
 }
 
 // IsUpdateBranch return true if it's not the first push to a branch
 func (opts *PushUpdateOptions) IsUpdateBranch() bool {
-	return opts.IsBranch() && opts.IsUpdateRef()
+	return opts.RefFullName.IsBranch() && opts.IsUpdateRef()
 }
 
 // IsDelBranch return true if it's a deletion to a branch
 func (opts *PushUpdateOptions) IsDelBranch() bool {
-	return opts.IsBranch() && opts.IsDelRef()
-}
-
-// TagName returns simple tag name if it's an operation to a tag
-func (opts *PushUpdateOptions) TagName() string {
-	return opts.RefFullName[len(git.TagPrefix):]
-}
-
-// BranchName returns simple branch name if it's an operation to branch
-func (opts *PushUpdateOptions) BranchName() string {
-	return opts.RefFullName[len(git.BranchPrefix):]
+	return opts.RefFullName.IsBranch() && opts.IsDelRef()
 }
 
 // RefName returns simple name for ref
 func (opts *PushUpdateOptions) RefName() string {
-	if strings.HasPrefix(opts.RefFullName, git.TagPrefix) {
-		return opts.RefFullName[len(git.TagPrefix):]
-	} else if strings.HasPrefix(opts.RefFullName, git.BranchPrefix) {
-		return opts.RefFullName[len(git.BranchPrefix):]
-	}
-	return ""
+	return opts.RefFullName.ShortName()
 }
 
 // RepoFullName returns repo full name