Add changelog section to project proposal and implementation plan

[dhruvkb]

Fixes

Fixes #4619 by @zackkrida

Description

This PR adds a changelog section to the bottom of the project proposal and implementation plans. It uses the format that @AetherUnbound suggested. It seems as if there was good consensus around the idea as well as the proposed format, only that wasn't formally indicated on the issue.

Testing Instructions

There's not really a need to test this change but if you want you can run the documentation/create-project recipe to see if the output is correct.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

Developer Certificate of Origin

Developer Certificate of Origin

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    have the right to submit it under the open source license
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[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/5253

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Changed files 🔄:

• https://docs.openverse.org/_preview/5253/projects/templates/implementation_plan.html
• https://docs.openverse.org/_preview/5253/projects/templates/project_proposal.html

[AetherUnbound]

Thanks for incorporating this - it looks good!

[zackkrida]

LGTM!