mixed builds: Make apex's GetBazelLabel return the label of the override_apex, if applicable.

And add test1_com.android.tzdata to prod allowlist.

Fixes: 261054570
Bug: 261054570
Test: mkcompare
Change-Id: I314a4e44ade958ba9a91f71430d76175d734579e
diff --git a/android/allowlists/allowlists.go b/android/allowlists/allowlists.go
index 5218a58..63fe462 100644
--- a/android/allowlists/allowlists.go
+++ b/android/allowlists/allowlists.go
@@ -1364,7 +1364,10 @@
 
 	// Bazel prod-mode allowlist. Modules in this list are built by Bazel
 	// in either prod mode or staging mode.
-	ProdMixedBuildsEnabledList = []string{"com.android.tzdata"}
+	ProdMixedBuildsEnabledList = []string{
+		"com.android.tzdata",
+		"test1_com.android.tzdata",
+	}
 
 	// Staging-mode allowlist. Modules in this list are only built
 	// by Bazel with --bazel-mode-staging. This list should contain modules