fix: Create scripts/fix/mod-tidy.sh and refactor test.sh

- Create scripts/fix/mod-tidy.sh with proper workspace module iteration
- Remove go.sum files before tidy to ensure clean state (regenerated by go mod tidy)
- Use run wrapper for consistent command execution and logging
- Update Makefile fix-mod-tidy target to use the new script
- Add ETCD_ROOT_DIR support for dynamic path resolution
- Delete module_mod_tidy_fix and mod_tidy_fix_pass functions from scripts/test.sh
  (functionality moved to scripts/fix/mod-tidy.sh)

Signed-off-by: Himanshu Singh <himanshuich20@gmail.com>

scripts/fix/mod-tidy.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+# Copyright 2026 The etcd Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -euo pipefail
+
+ETCD_ROOT_DIR=${ETCD_ROOT_DIR:-$(git rev-parse --show-toplevel)}
+source "${ETCD_ROOT_DIR}/scripts/test_lib.sh"
+
+log_callout "Tidying go.mod files"
+run_for_workspace_modules run sh -c "rm -f ./go.sum && go mod tidy"
+log_success "go.mod files tidied"

scripts/test.sh

@@ -627,15 +627,6 @@ function mod_tidy_pass {
   run_for_workspace_modules run go mod tidy -diff
 }
 
-function module_mod_tidy_fix {
-  run rm ./go.sum
-  run go mod tidy || return 2
-}
-
-function mod_tidy_fix_pass {
-  run_for_workspace_modules module_mod_tidy_fix
-}
-
 function proto_annotations_pass {
   "${ETCD_ROOT_DIR}/scripts/verify_proto_annotations.sh"
 }