escape filename when assemble URL (#22850) (#22871)

Backport #22850

Fixes: #22843 

### Cause:

https://github.com/go-gitea/gitea/blob/affdd40296960a08a4223330ccbd1fb88c96ea1a/services/repository/files/content.go#L161

Previously, we did not escape the **"%"** that might be in "treePath"
when call "url.parse()".


![image](https://user-images.githubusercontent.com/33891828/218066318-5a909e50-2a17-46e6-b32f-684b2aa4b91f.png)

This function will check whether "%" is the beginning of an escape
character. Obviously, the "%" in the example (hello%mother.txt) is not
that. So, the function will return a error.

### Solution:
We can escape "treePath" by call "url.PathEscape()" function firstly.

### Screenshot:

![image](https://user-images.githubusercontent.com/33891828/218069781-1a030f8b-18d0-4804-b0f8-73997849ef43.png)

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: sillyguodong <33891828+sillyguodong@users.noreply.github.com>
Co-authored-by: Andrew Thornton <art27@cantab.net>

modules/lfs/endpoint.go

@@ -5,7 +5,6 @@
 package lfs
 
 import (
-	"fmt"
 	"net/url"
 	"os"
 	"path"
@@ -13,6 +12,7 @@ import (
 	"strings"
 
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/util"
 )
 
 // DetermineEndpoint determines an endpoint from the clone url or uses the specified LFS url.
@@ -96,7 +96,7 @@ func endpointFromLocalPath(path string) *url.URL {
 		return nil
 	}
 
-	path = fmt.Sprintf("file://%s%s", slash, filepath.ToSlash(path))
+	path = "file://" + slash + util.PathEscapeSegments(filepath.ToSlash(path))
 
 	u, _ := url.Parse(path)