Link CLI/language pack notes from new bundle changelog

Author: henrymercer

.github/workflows/script/bundle_changelog.py

@@ -2,9 +2,15 @@
 import os
 import re
 
+cli_version = os.environ['CLI_VERSION']
+
+# Link the GitHub Release corresponding to the new bundle version.
+bundle_release_url = f"https://github.com/github/codeql-action/releases/codeql-bundle-v{cli_version}"
+bundle_note = f"To learn more about the relevant changes to the CodeQL CLI and language packs, see the [bundle release]({bundle_release_url})."
+
 # Get the PR number from the PR URL.
 pr_number = os.environ['PR_URL'].split('/')[-1]
-changelog_note = f"- Update default CodeQL bundle version to {os.environ['CLI_VERSION']}. [#{pr_number}]({os.environ['PR_URL']})"
+changelog_note = f"- Update default CodeQL bundle version to {cli_version}. {bundle_note} [#{pr_number}]({os.environ['PR_URL']})"
 
 # If the "[UNRELEASED]" section starts with "no user facing changes", remove that line.
 with open('CHANGELOG.md', 'r') as f: