[build] Exclude end2end experiment variations from distribtests (#34850)

bazel/grpc_build_system.bzl

@@ -429,7 +429,7 @@ def expand_tests(name, srcs, deps, tags, args, exclude_pollers, uses_polling, us
                     env["GRPC_EXPERIMENTS"] = experiment
                     env["GRPC_CI_EXPERIMENTS"] = "1"
                     config["env"] = env
-                    tags = config["tags"]
+                    tags = config["tags"] + ["experiment_variation"]
                     for tag in must_have_tags + enabled_tags:
                         if tag not in tags:
                             tags = tags + [tag]
@@ -445,7 +445,7 @@ def expand_tests(name, srcs, deps, tags, args, exclude_pollers, uses_polling, us
                     env["GRPC_EXPERIMENTS"] = "-" + experiment
                     env["GRPC_CI_EXPERIMENTS"] = "1"
                     config["env"] = env
-                    tags = config["tags"]
+                    tags = config["tags"] + ["experiment_variation"]
                     for tag in must_have_tags + disabled_tags:
                         if tag not in tags:
                             tags = tags + [tag]

test/distrib/bazel/test_single_bazel_version.sh

@@ -86,8 +86,8 @@ do
   SHARD_RAN=""
   if [ "${TEST_SHARD}" == "buildtest" ] ; then
     tools/bazel version | grep "$VERSION" || { echo "Detected bazel version did not match expected value of $VERSION" >/dev/stderr; exit 1; }
-    tools/bazel build "${ACTION_ENV_FLAG}" -- //... "${EXCLUDED_TARGETS[@]}" || FAILED_TESTS="${FAILED_TESTS}buildtest "
-    tools/bazel build "${ACTION_ENV_FLAG}" --config fuzztest -- //fuzztest/... || FAILED_TESTS="${FAILED_TESTS}fuzztest_buildtest "
+    tools/bazel build "${ACTION_ENV_FLAG}" --build_tag_filters='-experiment_variation' -- //... "${EXCLUDED_TARGETS[@]}" || FAILED_TESTS="${FAILED_TESTS}buildtest "
+    tools/bazel build "${ACTION_ENV_FLAG}" --config fuzztest --build_tag_filters='-experiment_variation' -- //fuzztest/... || FAILED_TESTS="${FAILED_TESTS}fuzztest_buildtest "
     SHARD_RAN="true"
   fi