[.github] clean + add codeowners

.github/CODEOWNERS

@@ -0,0 +1,2 @@
+*                       @Spotinst/team-bigdata
+/.github/               @Spotinst/team-bigdata-devops

.github/pull_request_template.md

@@ -1,26 +1,31 @@
-<!--
-Thanks for contributing to JupyterLab!
-Please fill out the following items to submit a pull request.
-See the contributing guidelines for more information:
-https://github.com/jupyterlab/jupyterlab/blob/3.6.x/CONTRIBUTING.md
--->
+## Jira ticket
 
-## References
+https://spotinst.atlassian.net/browse/BGD-XXXX
 
-<!-- Note issue numbers this pull request addresses (should be at least one, see contributing guidelines above). -->
+## Checklist
+- [ ] I added a Jira ticket link
+- [ ] I added a changeset with the `simple-changeset add` command
+- [ ] I filled in the test plan
+- [ ] I executed the tests and filled in the test results
 
-<!-- Note any other pull requests that address this issue and how this pull request is different. -->
+## Why
 
-## Code changes
+_A short description of why this change is necessary. If this is a bug fix, include steps to reproduce the issue_
 
-<!-- Describe the code changes and how they address the issue. -->
+## What
 
-## User-facing changes
+_What has been modified. Expose the key decisions you have made during this PR to facilitate the discussion with your reviewer_
 
-<!-- Describe any visual or user interaction changes and how they address the issue. -->
+## How to test
 
-<!-- For visual changes, include before and after screenshots here. -->
+_Step by step instructions to test your feature/fix_
 
-## Backwards-incompatible changes
+## Test plan and results
 
-<!-- Describe any backwards-incompatible changes to JupyterLab public APIs. -->
+_Feel free to add screenshots showing test results_
+
+| Test | Description       | Result | Notes                      |
+|------|-------------------|--------|----------------------------|
+| 1    | Test with input A | Pass   | Some notes about the test  |
+| 2    | Test with input B | Pass   | Some notes about the test  |
+| 3    | Test with input C | Pass   | Some notes about the test  |