Fix exercise T4L2/tags-push (#201)

# Exercise Review

## Exercise Discussion


#194 (comment)

## Checklist

- [ ] If you require a new remote repository on the `Git-Mastery`
organization, have you [created a
request](https://github.com/git-mastery/exercises/issues/new?template=request_exercise_repository.md)
for it?
- [x] Have you written unit tests using
[`repo-smith`](https://github.com/git-mastery/repo-smith) to validate
the exercise grading scheme?
- [x] Have you tested the download script using `test-download.sh`?
- [x] Have you verified that this exercise does not already exist or is
not currently in review?
- [ ] Did you introduce a new grading mechanism that should belong to
[`git-autograder`](https://github.com/git-mastery/git-autograder)?
- [ ] Did you introduce a new dependency that should belong to
[`app`](https://github.com/git-mastery/app)?

Author: VikramGoyal23

tags_push/verify.py

@@ -37,8 +37,8 @@ def get_username() -> Optional[str]:
     return run_command(["gh", "api", "user", "-q", ".login"])
 
 
-def get_remote_tags(username: str) -> List[str]:
-    raw_tags = run_command(["git", "ls-remote", "--tags"])
+def get_remote_tags(username: str, exercise: GitAutograderExercise) -> List[str]:
+    raw_tags = exercise.repo.repo.git.ls_remote("--tags")
     if raw_tags is None:
         return []
     return [line.split("/")[2] for line in raw_tags.strip().splitlines()]
@@ -49,7 +49,7 @@ def verify(exercise: GitAutograderExercise) -> GitAutograderOutput:
     if username is None:
         raise exercise.wrong_answer([IMPROPER_GH_CLI_SETUP])
 
-    tag_names = get_remote_tags(username)
+    tag_names = get_remote_tags(username, exercise)
 
     comments = []