Follow symlinks in reading data file

PatchUtilsTest.GatherDumpMetadata and PatchUtilsTest.GatherMetadata
failed when data file is under Bazel's runfile dir. Reading file
would fail if we don't follow symlink since the data file is a symlink
to the real file in $ANDROID_HOST_OUT dir.

See https://docs.bazel.build/versions/2.0.0/output_directories.html for
more information.

Bug: 211806329
Test: atest --bazel-mode fastdeploy_test_host
Test: atest fastdeploy_test
Change-Id: I3d4f6e08aa36bebc012a5970f55babc5d8d75e59

fastdeploy/deploypatchgenerator/patch_utils_test.cpp

@@ -93,7 +93,7 @@ TEST(PatchUtilsTest, GatherMetadata) {
 
     std::string expectedMetadata;
     android::base::ReadFileToString(GetTestFile("rotating_cube-metadata-release.data"),
-                                    &expectedMetadata);
+                                    &expectedMetadata, true);
     APKMetaData expected;
     EXPECT_TRUE(expected.ParseFromString(expectedMetadata));
 
@@ -123,7 +123,7 @@ TEST(PatchUtilsTest, GatherDumpMetadata) {
 
     {
         std::string cd;
-        android::base::ReadFileToString(GetTestFile("sample.cd"), &cd);
+        android::base::ReadFileToString(GetTestFile("sample.cd"), &cd, true);
 
         APKDump dump;
         dump.set_cd(std::move(cd));