Fix formatting: list comprehension and import order

- Split list comprehension across lines in test_prelude.py
- Sort imports alphabetically in approval_validation.py.test

Author: seemethere

src/ghstack/test_prelude.py

@@ -452,7 +452,8 @@ def set_pr_check_runs(
     repo = github.state.repository("pytorch", "pytorch")
     pr = github.state.pull_request(repo, ghstack.github_fake.GitHubNumber(pr_number))
     pr.check_runs = [
-        ghstack.github_fake.CheckRun(name=n, status=s, conclusion=c) for n, s, c in checks
+        ghstack.github_fake.CheckRun(name=n, status=s, conclusion=c)
+        for n, s, c in checks
     ]
 
 

test/merge_rules/approval_validation.py.test

@@ -1,7 +1,7 @@
 from ghstack.test_prelude import *
 
 import ghstack.merge_rules
-from ghstack.github_fake import PullRequestReview, GitHubNumber
+from ghstack.github_fake import GitHubNumber, PullRequestReview
 
 init_test()
 commit("A")