Add weak_sancov_stubs as a dependency of functional_test.

This is needed because we build the test binary with sancov instrumentation,
even if we only use it to check that the instrumentation exists.

PiperOrigin-RevId: 688218582

e2e_tests/BUILD

diff --git a/e2e_tests/BUILD b/e2e_tests/BUILD
index ebd11cb..bb59346 100644
--- a/e2e_tests/BUILD
+++ b/e2e_tests/BUILD
@@ -60,6 +60,7 @@
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/strings:str_format",
         "@com_google_absl//absl/time",
+        "@com_google_fuzztest//centipede:weak_sancov_stubs",
         "@com_google_fuzztest//domain_tests:domain_testing",
         "@com_google_fuzztest//fuzztest:io",
         "@com_google_fuzztest//fuzztest:logging",