Add "Go to file", "Delete Directory" to repo file list page (#35911)

/claim #35898
Resolves #35898 

### Summary of key changes:

1. Add file name search/Go to file functionality to repo button row.
2. Add backend functionality to delete directory
3. Add context menu for directories with functionality to copy path & delete a directory
4. Move Add/Upload file dropdown to right for parity with Github UI
5. Add tree view to the edit/upload UI

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/repo/blame.go

@@ -10,7 +10,6 @@ import (
 	"net/url"
 	"path"
 	"strconv"
-	"strings"
 
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
@@ -42,8 +41,8 @@ type blameRow struct {
 
 // RefBlame render blame page
 func RefBlame(ctx *context.Context) {
-	ctx.Data["PageIsViewCode"] = true
 	ctx.Data["IsBlame"] = true
+	prepareRepoViewContent(ctx, ctx.Repo.RefTypeNameSubURL())
 
 	// Get current entry user currently looking at.
 	if ctx.Repo.TreePath == "" {
@@ -56,17 +55,6 @@ func RefBlame(ctx *context.Context) {
 		return
 	}
 
-	treeNames := strings.Split(ctx.Repo.TreePath, "/")
-	var paths []string
-	for i := range treeNames {
-		paths = append(paths, strings.Join(treeNames[:i+1], "/"))
-	}
-
-	ctx.Data["Paths"] = paths
-	ctx.Data["TreeNames"] = treeNames
-	ctx.Data["BranchLink"] = ctx.Repo.RepoLink + "/src/" + ctx.Repo.RefTypeNameSubURL()
-	ctx.Data["RawFileLink"] = ctx.Repo.RepoLink + "/raw/" + ctx.Repo.RefTypeNameSubURL() + "/" + util.PathEscapeSegments(ctx.Repo.TreePath)
-
 	blob := entry.Blob()
 	fileSize := blob.Size()
 	ctx.Data["FileSize"] = fileSize