fix: npm run fetch-changelog fails on a fresh clone

[Anshumancanrock]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR fixes npm run fetch-changelog <version> failing on a fresh clone.

It exits 1 on a clean checkout. updateAuthorsJson() reads changelog/source/authors.json
without checking it exists, and the catch re-throws, so main() bails before anything gets
written, including CHANGELOG.md. changelog/source/ is gitignored and only generated by the
changelog plugin at build time, so it isn't there on a fresh clone or in CI.

The fix, in updateAuthorsJson(): make the directory first, and start from an empty map when
authors.json isn't there yet.

Which issue(s) this PR fixes:

Fixes #693

Checklist:

• npm run lint and npm run format:check pass (prettier run on the changed file via npx,
  repo deps aren't installed locally; markdownlint only covers docs/, tutorials/, blog/)
• npm run build succeeds for both en and zh (not run, this is a standalone release
  script and nothing in the Docusaurus build imports it)
• Chinese translation updated if English docs changed (or noted why not) (n/a, no docs touched)
• Commits are signed off (git commit -s)

Summary by CodeRabbit

• Bug Fixes
  • Improved changelog author updates by creating missing directories and handling absent author records automatically.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The changelog script now creates the authors directory when needed and handles a missing authors.json by starting with an empty author map.

Changes

Changelog author storage

Layer / File(s)	Summary
Initialize author storage src/scripts/fetch-changelog.js	updateAuthorsJson creates the parent directory recursively and loads existing authors only when authors.json exists. Otherwise, it starts with an empty object before adding contributors and writing updates.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: mesutoezdil

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes create the missing directory and handle absent authors.json, satisfying issue #693.
Out of Scope Changes check	✅ Passed	The changes are limited to making changelog generation work when generated authors files are absent.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the failure fixed by the pull request on a fresh clone.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[mesutoezdil]

/lgtm

[windsonsea]

/approve

[hami-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Anshumancanrock, windsonsea

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