[hp-remote-branch-push] Improve hands-on T8L1/hp-remote-branch-push (#231)

# Exercise Review

## Exercise Discussion

Fixes #186

## 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.yaml)
for it?
- [ ] 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 your changes using the instructions posted?
- [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: jiaxinnns

hands_on/remote_branch_push.py

@@ -1,9 +1,10 @@
 from exercise_utils.git import clone_repo_with_git
 from exercise_utils.github_cli import (
+    delete_repo,
     fork_repo,
     get_fork_name,
     get_github_username,
-    has_fork,
+    has_repo,
 )
 
 __requires_git__ = True
@@ -16,11 +17,15 @@
 
 def download(verbose: bool):
     username = get_github_username(verbose)
+    full_repo_name = f"{username}/{FORK_NAME}"
 
-    if not has_fork(REPO_NAME, REPO_OWNER, username, verbose):
-        fork_repo(f"{REPO_OWNER}/{REPO_NAME}", FORK_NAME, verbose, False)
+    if has_repo(full_repo_name, True, verbose):
+        delete_repo(full_repo_name, verbose)
+
+    fork_repo(f"{REPO_OWNER}/{REPO_NAME}", FORK_NAME, verbose, False)
 
     existing_name = get_fork_name(REPO_NAME, REPO_OWNER, username, verbose)
     clone_repo_with_git(
-        f"https://github.com/{username}/{existing_name}", verbose, FORK_NAME
+        f"https://github.com/{username}/{existing_name}", verbose, REPO_NAME
     )
+