Fix block_cache_test failure (#7783)

Summary:
`block_cache_tracer_test` and `block_cache_trace_analyzer_test` are using the same test directory. Which causes build failure if these 2 tests are running in parallel, for example: https://app.circleci.com/pipelines/github/facebook/rocksdb/5211/workflows/8639afbe-9fec-43e2-a6a4-6d47ea9cbcbe/jobs/74598/tests

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7783

Reviewed By: akankshamahajan15

Differential Revision: D25656762

Pulled By: jay-zhuang

fbshipit-source-id: 68aa020aa5b4b3bce324315edecb4e1a60cc18e6

CMakeLists.txt

@@ -1174,6 +1174,7 @@ if(WITH_TESTS)
         table/table_test.cc
         table/block_fetcher_test.cc
         test_util/testutil_test.cc
+        trace_replay/block_cache_tracer_test.cc
         trace_replay/io_tracer_test.cc
         tools/block_cache_analyzer/block_cache_trace_analyzer_test.cc
         tools/io_tracer_parser_test.cc

tools/block_cache_analyzer/block_cache_trace_analyzer_test.cc

@@ -44,7 +44,7 @@ const size_t kArgBufferSize = 100000;
 class BlockCacheTracerTest : public testing::Test {
  public:
   BlockCacheTracerTest() {
-    test_path_ = test::PerThreadDBPath("block_cache_tracer_test");
+    test_path_ = test::PerThreadDBPath("block_cache_trace_analyzer_test");
     env_ = ROCKSDB_NAMESPACE::Env::Default();
     EXPECT_OK(env_->CreateDir(test_path_));
     trace_file_path_ = test_path_ + "/block_cache_trace";