Set default compilation mode to fastbuild in cc_analysis_test.

This ensures a consistent default compilation mode for tests using cc_analysis_test and fixes [tap/third_party.bazel_rules.rules_cc.opt]([]

PiperOrigin-RevId: 930590271
Change-Id: I23ca524639e5ef2c40e67c439faf7e47a0c8e26c

tests/cc/testutil/cc_analysis_test.bzl

diff --git a/tests/cc/testutil/cc_analysis_test.bzl b/tests/cc/testutil/cc_analysis_test.bzl
index f418aab..1ce958e 100644
--- a/tests/cc/testutil/cc_analysis_test.bzl
+++ b/tests/cc/testutil/cc_analysis_test.bzl
@@ -43,6 +43,7 @@
         str(with_features_flag): with_features,
         str(with_action_configs_flag): with_action_configs,
         "//command_line_option:features": test_features,
+        "//command_line_option:compilation_mode": "fastbuild",
     }
     if "config_settings" in kwargs:
         config_settings = dict(config_settings, **kwargs["config_settings"])