fix: Integrate Missing GitHub Actions template

[Bangarraju-Microsoft]

Purpose

This pull request adds a new GitHub issue template for subtasks. The template provides a structured format for engineers to describe and track subtasks related to a parent issue.

Issue tracking improvements:

• Added .github/ISSUE_TEMPLATE/subtask.md to introduce a dedicated template for creating and managing subtasks, including sections for description, parent issue link, and a checklist for tasks.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.

Other Information

[github-actions]

🎉 This PR is included in version 1.6.1 🎉

The release is available on GitHub release

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