Add cherry_pick.py script for ORT release

[tianleiwu]

This PR introduces a new Python script, cherry_pick.py, to automate the cherry-picking process for release branches.

Features

• Automated List Generation: Fetches merged PRs with a specific label (e.g., release:1.24.2) using the gh CLI.
• Sorted Output: Sorts PRs by merge date to ensure chronological application.
• Batch File Creation: Generates a .cmd file with git cherry-pick commands.
• Markdown Notes: Generates a markdown file (cherry_pick_pr_description.md) suitable for the release PR description.
• Dependency Checking: Checks for potential missing dependencies (conflicts) by verifying if files modified by the cherry-picked commits have prior modifications in the target branch that are not included in the cherry-pick list.
  • Warns about missing commits and lists affected files.

Usage

python cherry_pick.py --label "release:1.24.2" --output cherry_pick.cmd --branch "origin/rel-1.24.2"

Arguments

• --label: Label to filter PRs (required).
• --output: Output path for the batch file (required).
• --repo: Target repository (default: microsoft/onnxruntime).
• --branch: Target branch to compare against for dependency checks (default: HEAD).

Example Output

Fetching merged PRs with label 'release:1.24.2' from microsoft/onnxruntime...
Generated cherry_pick.cmd with 15 commits.
Generated cherry_pick_pr_description.md with 15 commits.

Checking for potential missing dependencies (conflicts)...
WARNING: In PR #27256 (5645b77...), file 'onnxruntime/core/platform/windows/telemetry.cc' was modified by commit 9486eedc4... (Record service in telemetry events (#27252)) which is not included in the cherry-pick list.

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Pull request overview

Adds a new helper script under tools/python/ to streamline generating release-branch cherry-pick command batches and accompanying PR-description notes, using GitHub CLI metadata and optional git-history checks to flag potential missing related commits.

Changes:

• Introduces tools/python/cherry_pick.py to query merged PRs by label via gh pr list, sort by merge time, and emit a .cmd file of git cherry-pick commands.
• Generates cherry_pick_pr_description.md containing the set of PR numbers included in the cherry-pick batch.
• Adds a “missing dependencies” heuristic that inspects git history for other commits touching the same files that aren’t in the cherry-pick set.

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