fix: add check for ADR to PR template

[gemmadanks]

What changes did you make (give an overview)?

• Added item to PR template checklist for ADR
• Removed unused sections of PR template

Prerequisites checklist

Please check each of the following before merging:

• I have updated any relevant documentation
• I have added unit tests for any new code
• I have linked to any relevant issues
• I will squash my commits and, where needed, edit the commit messages to make them more informative follow the conventional commits format
• This pull request is ready to merge (leave unchecked to indicate a WIP)

What is the purpose of this pull request?

Check all that apply:

• Documentation update
• Bug fix
• New feature
• Changes to an existing feature
• Refactor
• Increasing test coverage
• Other, please explain:

[Copilot]

Pull Request Overview

Adds an ADR (Architecture Decision Record) requirement to the pull request template and removes ancillary reviewer guidance sections.

• Added checklist item to ensure ADRs are created for architecturally significant changes
• Removed reviewer focus and miscellaneous comments sections

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[Copilot]

Pull Request Overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull Request Overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

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_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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