🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Author: gcf-owl-bot[bot]

.kokoro/test-samples-impl.sh

@@ -20,8 +20,6 @@ set -eo pipefail
 # Enables `**` to include files nested inside sub-folders
 shopt -s globstar
 
-DIFF_FROM="origin/main..."
-
 # Exit early if samples don't exist
 if ! find samples -name 'requirements.txt' | grep -q .; then
   echo "No tests run. './samples/**/requirements.txt' not found"
@@ -73,16 +71,6 @@ for file in samples/**/requirements.txt; do
     file=$(dirname "$file")
     cd "$file"
 
-    # If $DIFF_FROM is set, use it to check for changes in this directory.
-    if [[ -n "${DIFF_FROM:-}" ]]; then
-        git diff --quiet "$DIFF_FROM" .
-        CHANGED=$?
-        if [[ "$CHANGED" -eq 0 ]]; then
-          # echo -e "\n Skipping $file: no changes in folder.\n"
-          continue
-        fi
-    fi
-
     echo "------------------------------------------------------------"
     echo "- testing $file"
     echo "------------------------------------------------------------"