Cleanup PR template: remove redundant fields (#17956)

- Remove Title section (already in PR title)
- Remove screenshot requirement (CI validates tests)

Co-authored-by: Krish Dholakia <krrishdholakia@gmail.com>

.github/pull_request_template.md

@@ -1,7 +1,3 @@
-## Title
-
-<!-- e.g. "Implement user authentication feature" -->
-
 ## Relevant issues
 
 <!-- e.g. "Fixes #000" -->
@@ -11,7 +7,6 @@
 **Please complete all items before asking a LiteLLM maintainer to review your PR**
 
 - [ ] I have Added testing in the [`tests/litellm/`](https://github.com/BerriAI/litellm/tree/main/tests/litellm) directory, **Adding at least 1 test is a hard requirement** - [see details](https://docs.litellm.ai/docs/extras/contributing_code)
-- [ ] I have added a screenshot of my new test passing locally
 - [ ] My PR passes all unit tests on [`make test-unit`](https://docs.litellm.ai/docs/extras/contributing_code)
 - [ ] My PR's scope is as isolated as possible, it only solves 1 specific problem