WIP: Revert "Update CI pipeline to only run checks step on version …

…bump PRs (backport #29243) (#29540)"

This reverts commit b76b9da.

ci/buildkite-pipeline.sh

@@ -302,29 +302,6 @@ pull_or_push_steps() {
     wait_step
   fi
 
-  # Version bump PRs are an edge case that can skip most of the CI steps
-  if affects .toml$ && affects .lock$ && ! affects_other_than .toml$ .lock$; then
-    optional_old_version_number=$(git diff "$BUILDKITE_PULL_REQUEST_BASE_BRANCH"..HEAD validator/Cargo.toml | \
-      grep -e "^-version" | sed  's/-version = "\(.*\)"/\1/')
-    echo "optional_old_version_number: ->$optional_old_version_number<-"
-    new_version_number=$(grep -e  "^version = " validator/Cargo.toml | sed 's/version = "\(.*\)"/\1/')
-    echo "new_version_number: ->$new_version_number<-"
-
-    # Every line in a version bump diff will match one of these patterns. Since we're using grep -v the output is the
-    # lines that don't match. Any diff that produces output here is not a version bump.
-    # | cat is a no-op. If this pull request is a version bump then grep will output no lines and have an exit code of 1.
-    # Piping the output to cat prevents that non-zero exit code from exiting this script
-    diff_other_than_version_bump=$(git diff "$BUILDKITE_PULL_REQUEST_BASE_BRANCH"..HEAD | \
-      grep -vE "^ |^@@ |^--- |^\+\+\+ |^index |^diff |^-( \")?solana.*$optional_old_version_number|^\+( \")?solana.*$new_version_number|^-version|^\+version"|cat)
-    echo "diff_other_than_version_bump: ->$diff_other_than_version_bump<-"
-
-    if [ -z "$diff_other_than_version_bump" ]; then
-      echo "Diff only contains version bump."
-      command_step checks ". ci/rust-version.sh; ci/docker-run.sh \$\$rust_nightly_docker_image ci/test-checks.sh" 20
-      exit 0
-    fi
-  fi
-
   # Run the full test suite by default, skipping only if modifications are local
   # to some particular areas of the tree
   if affects_other_than ^.buildkite ^.mergify .md$ ^docs/ ^web3.js/ ^explorer/ ^.gitbook; then