chore: improve structrue of PULL_REQUEST_TEMPLATE.md

[hyf0]

Summary

Move the Related issue part to the top, which is the only part requested to be written manually.

🤖 Generated by Copilot at dcc8f8b

Swapped the order of Related issue and Summary sections in the pull request template file .github/PULL_REQUEST_TEMPLATE.md to improve visibility and consistency.

Related issue (if exists)

Walkthrough

🤖 Generated by Copilot at dcc8f8b

• Swap the order of the Related issue and Summary sections in the pull request template (link). This makes the related issue more visible and follows the convention of other repositories in the web-infra-dev organization. The pull request template is in the file .github/PULL_REQUEST_TEMPLATE.md.

[changeset-bot]

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