Rust protobuf 2->3: Update build system

tldr: remove protobuf2 from Android Rust and upgrade everything to pb3.

These commits update:
- The grpcio rust crate to use protobuf 3
- The build system to always use the new libprotobuf (pb3) instead of the _deprecated variant (for pb2); they also force-enable libprotobuf everywhere, ignoring the use_protobuf3 flag, removes the tests related to pb2
- The following modules, which required syntax changes:
-- packages/modules/Bluetooth
-- device/google/cuttlefish
-- vendor/auto

Bug: 308790516
Test: m rust
Ignore-AOSP-First: must be done in main to upgrade cuttlefish+vendor with the rest all at once
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:7d0783ce22b3d7d369786d4b16067c79c033185b)
Merged-In: I1d07c433aca41ccfe2e710821cf930c413dc12d6
Change-Id: I1d07c433aca41ccfe2e710821cf930c413dc12d6

rust/protobuf_test.go

@@ -21,54 +21,6 @@ import (
 	"android/soong/android"
 )
 
-func TestRustProtobuf(t *testing.T) {
-	ctx := testRust(t, `
-		rust_protobuf {
-			name: "librust_proto",
-			protos: ["buf.proto", "proto.proto"],
-			crate_name: "rust_proto",
-			source_stem: "buf",
-			shared_libs: ["libfoo_shared"],
-			static_libs: ["libfoo_static"],
-		}
-		cc_library_shared {
-			name: "libfoo_shared",
-			export_include_dirs: ["shared_include"],
-		}
-		cc_library_static {
-			name: "libfoo_static",
-			export_include_dirs: ["static_include"],
-		}
-	`)
-	// Check that libprotobuf is added as a dependency.
-	librust_proto := ctx.ModuleForTests("librust_proto", "android_arm64_armv8-a_dylib").Module().(*Module)
-	if !android.InList("libprotobuf_deprecated", librust_proto.Properties.AndroidMkDylibs) {
-		t.Errorf("libprotobuf_deprecated dependency missing for rust_protobuf (dependency missing from AndroidMkDylibs)")
-	}
-
-	// Make sure the correct plugin is being used.
-	librust_proto_out := ctx.ModuleForTests("librust_proto", "android_arm64_armv8-a_source").Output("buf.rs")
-	cmd := librust_proto_out.RuleParams.Command
-	if w := "protoc-gen-rust-deprecated"; !strings.Contains(cmd, w) {
-		t.Errorf("expected %q in %q", w, cmd)
-	}
-
-	// Check exported include directories
-	if w := "-Ishared_include"; !strings.Contains(cmd, w) {
-		t.Errorf("expected %q in %q", w, cmd)
-	}
-	if w := "-Istatic_include"; !strings.Contains(cmd, w) {
-		t.Errorf("expected %q in %q", w, cmd)
-	}
-
-	// Check proto.rs, the second protobuf, is listed as an output
-	librust_proto_outputs := ctx.ModuleForTests("librust_proto", "android_arm64_armv8-a_source").AllOutputs()
-	if android.InList("proto.rs", librust_proto_outputs) {
-		t.Errorf("rust_protobuf is not producing multiple outputs; expected 'proto.rs' in list, got: %#v ",
-			librust_proto_outputs)
-	}
-}
-
 func TestRustProtobuf3(t *testing.T) {
 	ctx := testRust(t, `
 		rust_protobuf {