remove shellcheck bazel (#10369)

ci/travis/format.sh

@@ -78,10 +78,6 @@ SHELLCHECK_FLAGS=(
   --exclude=2207  # "Prefer mapfile or read -a to split command output (or quote to avoid splitting)." -- these aren't compatible with macOS's old Bash
 )
 
-SHELLCHECK_BAZEL_FLAGS=(
-  --exclude=2043  # "This loop will only ever run once. Bad quoting or missing glob/expansion?" -- Bazel preprocessing can trigger this needlessly
-)
-
 YAPF_FLAGS=(
     '--style' "$ROOT/.style.yapf"
     '--recursive'
@@ -110,10 +106,6 @@ shellcheck_scripts() {
   shellcheck "${SHELLCHECK_FLAGS[@]}" "$@"
 }
 
-shellcheck_bazel() {
-  "${ROOT}"/ci/travis/bazel.py shellcheck "mnemonic(\"Genrule\", deps(//:*))" shellcheck "${SHELLCHECK_FLAGS[@]}" "${SHELLCHECK_BAZEL_FLAGS[@]}" "$@"
-}
-
 # Format specified files
 format_files() {
     local shell_files=() python_files=() bazel_files=()
@@ -150,12 +142,6 @@ format_files() {
     fi
 
     if shellcheck --shell=sh --format=diff - < /dev/null; then
-      if [ 0 -lt "${#bazel_files[@]}" ]; then
-        if ! shellcheck_bazel; then
-          echo "Bazel genrule() scripts cannot be fixed automatically; please fix manually." 1>&2
-          shellcheck_bazel --format=diff
-        fi
-      fi
       if [ 0 -lt "${#shell_files[@]}" ]; then
         local difference
         difference="$(shellcheck_scripts --format=diff "${shell_files[@]}" || true && printf "-")"
@@ -190,9 +176,6 @@ format_all() {
     fi
 
     if command -v shellcheck >/dev/null; then
-      echo "$(date)" "shellcheck bazel...."
-      shellcheck_bazel
-
       local shell_files non_shell_files
       non_shell_files=($(git ls-files -- ':(exclude)*.sh'))
       shell_files=($(git ls-files -- '*.sh'))
@@ -242,10 +225,6 @@ format_changed() {
     fi
 
     if command -v shellcheck >/dev/null; then
-        if ! git diff --diff-filter=ACRM --quiet --exit-code "$MERGEBASE" -- 'WORKSPACE' 'WORKSPACE.*' 'BUILD.*' '*.bzl' '*.bazel' &>/dev/null; then
-            shellcheck_bazel
-        fi
-
         local shell_files non_shell_files
         non_shell_files=($(git diff --name-only --diff-filter=ACRM "$MERGEBASE" -- ':(exclude)*.sh'))
         shell_files=($(git diff --name-only --diff-filter=ACRM "$MERGEBASE" -- '*.sh'))