pw_transfer: Make TransferClientTest manual

Followup to pwrev/97566: need to mark the test_suite manual as well to
exclude it from CI/CQ.

Tested:
By running `bazel test //pw_transfer/...:all`

Bug: b/235387007
Change-Id: I75fae16e5c1fd02b99278435e924ee120f9873fd
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/97574
Reviewed-by: Wyatt Hepler <hepler@google.com>
Pigweed-Auto-Submit: Ted Pudlik <tpudlik@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pw_transfer/java/test/dev/pigweed/pw_transfer/BUILD.bazel b/pw_transfer/java/test/dev/pigweed/pw_transfer/BUILD.bazel
index b07d2f9..a4b2955 100644
--- a/pw_transfer/java/test/dev/pigweed/pw_transfer/BUILD.bazel
+++ b/pw_transfer/java/test/dev/pigweed/pw_transfer/BUILD.bazel
@@ -40,6 +40,7 @@
 
 test_suite(
     name = "pw_transfer",
+    tags = ["manual"],
     tests = [
         ":TransferClientTest",
     ],