Disable layering_check for OSS-Fuzz

OSS-Fuzz builds fail with:
```
ERROR: /root/.cache/bazel/_bazel_root/17db7bb59affe64429348778697da03a/external/abseil-cpp~20230802.1/absl/strings/BUILD.bazel:591:11: Compiling absl/strings/internal/cordz_functions.cc failed: undeclared inclusion(s) in rule '@@abseil-cpp~20230802.1//absl/strings:cordz_functions':
this rule is missing dependency declarations for the following files included by 'absl/strings/internal/cordz_functions.cc':
  'bazel-out/k8-opt-ST-b76ee6246659/bin/external/abseil-cpp~20230802.1/absl/base/atomic_hook.cppmap'
  'bazel-out/k8-opt-ST-b76ee6246659/bin/external/abseil-cpp~20230802.1/absl/base/errno_saver.cppmap'
  'bazel-out/k8-opt-ST-b76ee6246659/bin/external/abseil-cpp~20230802.1/absl/base/log_severity.cppmap'
```

These files are emitted by Bazel when using the `layering_check`
feature. This looks like a bug or breaking change in clang.

.bazelrc

@@ -22,7 +22,7 @@ build --cxxopt=-std=c++14
 build --sandbox_tmpfs_path=/tmp
 
 # Strict dependency check for C++ includes.
-build --features=layering_check
+build:ci --features=layering_check
 
 # Target Java 11 to squelch warnings about Java 8 being deprecated.
 build --java_language_version=11

.github/workflows/bazel_test.yml

@@ -45,10 +45,10 @@ jobs:
             libblocksruntime-dev
       - name: Run unit tests
         run: |
-          bazel test --test_tag_filters=-fuzz-test --build_tests_only //...
+          bazel test --test_tag_filters=-fuzz-test --build_tests_only --config=ci //...
       - name: Run Address Sanitizer tests
         run: |
-          bazel test --test_tag_filters=-fuzz-test --build_tests_only --config=asan //...
+          bazel test --test_tag_filters=-fuzz-test --build_tests_only --config=ci --config=asan //...
   fuzzer_run_tests:
     name: Brief fuzz test runs (C++)
     runs-on: ubuntu-20.04
@@ -72,7 +72,7 @@ jobs:
             libblocksruntime-dev
       - name: Run smoke test
         run: |
-          bazel run ${{ matrix.target }} --config=${{ matrix.config }} -- --clean --timeout_secs=5
+          bazel run ${{ matrix.target }} --config=ci --config=${{ matrix.config }} -- --clean --timeout_secs=5
   regression_tests:
     name: Regression tests (C++)
     runs-on: ubuntu-20.04
@@ -92,7 +92,7 @@ jobs:
       - name: Run regression tests
         run: |
           bazel test --verbose_failures --test_output=all \
-              --build_tag_filters=fuzz-test --config=${{ matrix.config }} \
+              --build_tag_filters=fuzz-test --config=ci --config=${{ matrix.config }} \
               //examples:all
   coverage:
     name: Coverage gathering (C++)
@@ -110,7 +110,7 @@ jobs:
             libblocksruntime-dev
       - name: Gather coverage
         run: |
-          bazel coverage //examples:re2_fuzz_test
+          bazel coverage --config=ci //examples:re2_fuzz_test
       - name: Check coverage report
         run: |
           grep "SF:examples/re2_fuzz_test.cc" bazel-out/_coverage/_coverage_report.dat
@@ -129,7 +129,7 @@ jobs:
         run: sudo apt-get update && sudo apt-get install -yq clang
       - name: Run smoke test
         run: |
-          bazel run ${{ matrix.target }} --config=${{ matrix.config }} -- --clean --timeout_secs=5
+          bazel run ${{ matrix.target }} --config=ci --config=${{ matrix.config }} -- --clean --timeout_secs=5
   regression_tests_java:
     name: Regression tests (Java)
     runs-on: ubuntu-20.04
@@ -145,7 +145,7 @@ jobs:
       - name: Run regression tests
         run: |
           bazel test --verbose_failures --test_output=all \
-              --build_tag_filters=fuzz-test --config=${{ matrix.config }} \
+              --build_tag_filters=fuzz-test --config=ci --config=${{ matrix.config }} \
               //examples/java/...
   regression_tests_gcc:
     name: Regression tests (GCC)
@@ -157,7 +157,7 @@ jobs:
       - name: Run regression tests with GCC
         run: |
           bazel test --action_env=CC=gcc --action_env=CXX=g++ \
-              --verbose_failures --test_output=all \
+              --verbose_failures --test_output=all --config=ci \
               //examples/...
   regression_tests_mac:
     name: Regression tests (macOS)
@@ -168,7 +168,7 @@ jobs:
         uses: actions/checkout@v2
       - name: Run regression tests on macOS
         run: |
-          bazel test --verbose_failures --test_output=all //examples/...
+          bazel test --verbose_failures --test_output=all --config=ci //examples/...
   bzlmod_examples_libfuzzer:
     name: Bzlmod examples (libFuzzer)
     runs-on: ubuntu-20.04
@@ -178,7 +178,8 @@ jobs:
       - name: Run regression tests on macOS
         run: |
           cd examples/bzlmod
-          bazel test --verbose_failures --test_output=all --@rules_fuzzing//fuzzing:cc_engine=@rules_fuzzing//fuzzing/engines:libfuzzer //...
+          bazel test --verbose_failures --test_output=all \
+              --@rules_fuzzing//fuzzing:cc_engine=@rules_fuzzing//fuzzing/engines:libfuzzer //...
   bzlmod_examples_replay:
     name: Bzlmod examples (replay)
     runs-on: ubuntu-20.04
@@ -188,4 +189,5 @@ jobs:
       - name: Run regression tests on macOS
         run: |
           cd examples/bzlmod
-          bazel test --verbose_failures --test_output=all --@rules_fuzzing//fuzzing:cc_engine=@rules_fuzzing//fuzzing/engines:replay //...
+          bazel test --verbose_failures --test_output=all \
+              --@rules_fuzzing//fuzzing:cc_engine=@rules_fuzzing//fuzzing/engines:replay //...