Description
Currently, the evergreen runs the full test suite on a pull request even if the code formatting check (s_all) fails. This leads to wasted resources and time, as a PR with formatting issues cannot be merged anyway.

For example, when a developer forgets to run s_all locally, they have to push a new commit to fix the formatting, which then triggers the entire test suite to run again.

Proposed Solution
Modify the evergreen PR testing pipeline to make the s_all test a prerequisite. The evergreen should stop and fail immediately if s_all fails. This would prevent the more resource-intensive tests from running until all code formatting is corrected.

Acceptance Criteria

• The evergreen PR pipeline checks for s_all test status first.
• If the s_all test fails, the evergreen terminates without running subsequent tests.