Doc: Update pull_request_template.md checklist

[mariana-caetano]

What's the purpose of this pull request?

Added new items to the pull_request_template.md to help highlight the changes added in the CHANGELOG.md and Release Notes.

This is analogous to the #12 PR in gatsby.store.

How does it work?

The new items intended to help users and the team identify the changes in gatsby.store and keep a pattern in the CHANGELOG.md update.

Checklist Item	Before	Now
CHANGELOG entry added	✅	✅
Added an entry in the CHANGELOG.md at the beginning of its due section. The latest version should comes first.	❌	✅
Added the PR number with the PR link at the entry in the CHANGELOG.md	❌	✅
Updated the Storybook - if applicable.	❌	✅
Added a label according to the PR goal - Breaking change, Enhancement, Bug or Chore.	❌	✅
Added the component, hook, or pathname in-between backticks (``) - If applicable. E.g., ComponentName component.	❌	✅
Identified the function or parameter in the PR - If applicable. E.g., useWindowDimensions hook.	❌	✅
For documentation changes, ping @ carolinamenezes or @ Mariana-Caetano to review and update the changes.	❌	✅

How to test it?

Describe the steps with bullet points. Is there any external reference, link, or example?

References

• Keep a changelog
• Pull Request best practices

Checklist

You may erase this after checking them all ;)

• CHANGELOG entry added

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/apple-magic-mouse-99988212/p	📎   Access the Lighthouse report here.
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