Add standard PR template

[UsamaSadiq]

Summary

• Adds a standardized PR template with Related Ticket, Description, Type of Change, Testing, Screenshots, and Checklist sections
• Aligns PR workflow across all service repositories

Test plan

• Open a new PR in this repo and verify the template auto-populates

🤖 Generated with Claude Code

[github-actions]

	Fails
🚫	node failed.

Log

Details

�[31mError: �[39m SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
    at JSON.parse (<anonymous>)
�[90m    at parseJSONFromBytes (node:internal/deps/undici/undici:4337:19)�[39m
�[90m    at successSteps (node:internal/deps/undici/undici:6985:27)�[39m
�[90m    at readAllBytes (node:internal/deps/undici/undici:5908:13)�[39m
�[90m    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)�[39m
danger-results://tmp/danger-results-d0090c03.json

Generated by 🚫 dangerJS against 0e50154