Add --define="absl=1" to the Bazel build commands in CI

This is to allow using Abseil in GoogleTest, which would allow use of RE2.

PiperOrigin-RevId: 865975476
Change-Id: Ifdf62384b82a14e0fb569076333bee96647e7c1f

ci/linux_clang-latest_libcxx_asan_bazel.sh

@@ -94,6 +94,7 @@ for std in ${STD}; do
           --copt=\"-fno-sanitize-recover=${UBSAN_CHECKS}\" \
           --copt=\"-fno-sanitize-blacklist\" \
           --copt=-Werror \
+          --define=\"absl=1\" \
           --enable_bzlmod=true \
           --features=external_include_paths \
           --keep_going \

ci/linux_clang-latest_libcxx_tsan_bazel.sh

@@ -89,6 +89,7 @@ for std in ${STD}; do
           --copt=\"-fsanitize=thread\" \
           --copt=\"-fno-sanitize-blacklist\" \
           --copt=-Werror \
+          --define=\"absl=1\" \
           --enable_bzlmod=true \
           --features=external_include_paths \
           --keep_going \

ci/macos_xcode_bazel.sh

@@ -57,6 +57,7 @@ fi
 ${BAZEL_BIN} test ... \
   --copt="-DGTEST_REMOVE_LEGACY_TEST_CASEAPI_=1" \
   --copt="-Werror" \
+  --define="absl=1" \
   --cxxopt="-std=c++17" \
   --enable_bzlmod=true \
   --features=external_include_paths \