Mark fleetbench test target as manual so it's not run by bazel test ... but needs to be explicitly run.

It's large enough now that it can time out and the tests are already covered elsewhere.

PiperOrigin-RevId: 730541346
Change-Id: I83118c63f3cf30125b256ae17ddefb979ce8c166

Author: rjogrady

fleetbench/BUILD

@@ -86,6 +86,7 @@ cc_test(
     data = ["//fleetbench/compression:corpus"],
     linkstatic = 1,
     malloc = "@com_google_tcmalloc//tcmalloc",
+    tags = ["manual"],
     deps = [
         ":benchmark_main",
         "//fleetbench/compression:compression_benchmark_lib",