Use test context in tests and new loop system in benchmarks (#33648)

Replace all contexts in tests with go1.24 t.Context()

---------

Co-authored-by: Giteabot <teabot@gitea.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/git/blob_test.go

@@ -47,7 +47,7 @@ func Benchmark_Blob_Data(b *testing.B) {
 		b.Fatal(err)
 	}
 
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		r, err := testBlob.DataAsync()
 		if err != nil {
 			b.Fatal(err)