refactor!: remove go-git backend (#39487)

Removes the go-git backend so every build uses the git CLI backend. Its
Windows performance advantage is gone, it lacks SHA-256 support, and it
breaks repositories on Windows.

The performance changes moved to
https://github.com/go-gitea/gitea/pull/39526.

Fixes https://github.com/go-gitea/gitea/issues/38359
Fixes https://github.com/go-gitea/gitea/issues/34694

---------

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

modules/git/commit_info.go

@@ -113,3 +113,36 @@ func getLastCommitForPathsByCache(ctx context.Context, commitID, treePath string
 
 	return results, unHitEntryPaths, nil
 }
+
+// GetLastCommitForPaths returns last commit information
+func GetLastCommitForPaths(ctx context.Context, gitRepo *Repository, commit *Commit, treePath string, paths []string) (map[string]*Commit, error) {
+	// We read backwards from the commit to obtain all of the commits
+	revs, err := walkGitLog(ctx, gitRepo, commit, treePath, paths...)
+	if err != nil {
+		return nil, err
+	}
+
+	commitsMap := map[string]*Commit{}
+	commitsMap[commit.ID.String()] = commit
+
+	commitCommits := map[string]*Commit{}
+	for path, commitID := range revs {
+		if len(commitID) == 0 {
+			continue
+		}
+
+		c, ok := commitsMap[commitID]
+		if ok {
+			commitCommits[path] = c
+			continue
+		}
+
+		c, err := gitRepo.GetCommit(ctx, commitID) // Ensure the commit exists in the repository
+		if err != nil {
+			return nil, err
+		}
+		commitCommits[path] = c
+	}
+
+	return commitCommits, nil
+}