docs: add PULL_REQUEST_TEMPLATE.md for consistent PR descriptions

[rafaumeu]

Summary

Adds a .github/PULL_REQUEST_TEMPLATE.md tailored for plugin contributions. The Mattermost org-level template at mattermost/.github covers only Summary and Ticket Link. Plugin PRs are consistently asked for Release Notes, Testing steps, and a self-review checklist, which this template adds while preserving the org-level preamble and the #### heading style.

As suggested by @avasconcelos114 in #1035 (mattermost-plugin-github), since mattermost-plugin-demo is the source-of-truth for plugin-specific overrides, this is the appropriate place to introduce a plugin-optimized PR template that all plugin repos can inherit from.

Changes

• Added .github/PULL_REQUEST_TEMPLATE.md with sections:
  • Summary (what and why)
  • Changes (bullet list — server/webapp/build/CI affected)
  • Ticket Link (GitHub issue or JIRA, same format as org-level)
  • Release Notes (release-note / release-note-none fenced blocks)
  • Screenshots
  • Testing (manual steps and/or automated tests)
  • Checklist (style, self-review, docs, tests, make test*, release notes)
• Preserved the org-level preamble (contribution checklist + submitting great PRs links) so contributors keep seeing it
• Used #### headings to match the org-level template style

Ticket Link

No specific issue — developer experience improvement. Originally proposed in mattermost/mattermost-plugin-github#1035 and redirected here per maintainer guidance.

Testing

• Verified the file renders correctly when opening a test PR from the fork
• Template follows the Mattermost contribution patterns observed in the org-level PULL_REQUEST_TEMPLATE.md

Checklist

• Changes follow the project's code style guidelines
• Self-review completed
• Documentation updated (if applicable)
• New tests added / existing tests updated (if applicable)
• All existing tests pass
• Release notes included (or release-note-none)

[mattermost-build]

Hello @rafaumeu,

Thanks for your pull request! A Core Committer will review your pull request soon. For code contributions, you can learn more about the review process here.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 84ff6cc3-a61a-40e1-a9e5-f2dd711df8e4

📥 Commits

Reviewing files that changed from the base of the PR and between af0d3d8 and 36cf405.

📒 Files selected for processing (1)

• .github/PULL_REQUEST_TEMPLATE.md

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📝 Walkthrough

Walkthrough

Adds a GitHub pull request template with sections for change summaries, ticket links, release notes, screenshots, testing instructions, and a completion checklist.

Changes

Pull request template

Layer / File(s)	Summary
Template guidance and checklist .github/PULL_REQUEST_TEMPLATE.md	Adds structured PR documentation sections and checklist items covering review, documentation, testing, and release notes.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding a PR template for consistent descriptions.
Description check	✅ Passed	The description matches the changeset and explains the new pull request template in useful detail.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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