[SPARK-48723][INFRA] Run git cherry-pick --abort if backporting is …

…denied by committer

### What changes were proposed in this pull request?

This pull request includes the addition of `git cherry-pick --abort` to run if backporting is denied by committers.

Otherwise, the unresolved cherry-pick context will block following command to be run properly

```python
Error cherry-picking: Command '['git', 'cherry-pick', '-sx', 'e23d69b0']' returned non-zero exit status 1.
y fix-up this merge? (y/N): n
Okay, exiting
Restoring head pointer to master
git checkout master
error: you need to resolve your current index first
Restoring head pointer to master
git checkout master
error: you need to resolve your current index first
Traceback (most recent call last):
  File "/Users/hzyaoqin/spark/./dev/merge_spark_pr.py", line 234, in cherry_pick

  File "/Users/hzyaoqin/spark/./dev/merge_spark_pr.py", line 118, in run_cmd

  File "/opt/homebrew/Cellar/python3.11/3.11.8/Frameworks/Python.framework/Versions/3.11/lib/python3.11/subprocess.py", line 466, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```

### Why are the changes needed?

improve merge PR progress

### Does this PR introduce _any_ user-facing change?

no
### How was this patch tested?

Locally with python interpreter:
```python
>>> cherry_pick(47082, "e23d69b", "branch-3.5")
Enter a branch name [branch-3.5]:
git fetch apache branch-3.5:PR_TOOL_PICK_PR_47082_BRANCH-3.5
From github.com:apache/spark
 * [new branch]              branch-3.5 -> PR_TOOL_PICK_PR_47082_BRANCH-3.5
git checkout PR_TOOL_PICK_PR_47082_BRANCH-3.5
Updating files: 100% (6027/6027), done.
Switched to branch 'PR_TOOL_PICK_PR_47082_BRANCH-3.5'
git cherry-pick -sx e23d69b
error: could not apply e23d69b... [SPARK-48709][SQL] Fix varchar type resolution mismatch for DataSourceV2 CTAS
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
Error cherry-picking: Command '['git', 'cherry-pick', '-sx', 'e23d69b']' returned non-zero exit status 1.
 fix-up this merge? (y/N): n
git cherry-pick --abort
Okay, exiting
```

### Was this patch authored or co-authored using generative AI tooling?

no

Closes apache#47101 from yaooqinn/SPARK-48723.

Authored-by: Kent Yao <[email protected]>
Signed-off-by: Hyukjin Kwon <[email protected]>

dev/merge_spark_pr.py

@@ -118,9 +118,14 @@ def run_cmd(cmd):
         return subprocess.check_output(cmd.split(" ")).decode("utf-8")
 
 
-def continue_maybe(prompt):
+def continue_maybe(prompt, cherry=False):
     result = bold_input("%s (y/N): " % prompt)
     if result.lower() != "y":
+        if cherry:
+            try:
+                run_cmd("git cherry-pick --abort")
+            except Exception:
+                print_error("Unable to abort and get back to the state before cherry-pick")
         fail("Okay, exiting")
 
 
@@ -234,9 +239,9 @@ def cherry_pick(pr_num, merge_hash, default_branch):
         run_cmd("git cherry-pick -sx %s" % merge_hash)
     except Exception as e:
         msg = "Error cherry-picking: %s\nWould you like to manually fix-up this merge?" % e
-        continue_maybe(msg)
+        continue_maybe(msg, True)
         msg = "Okay, please fix any conflicts and finish the cherry-pick. Finished?"
-        continue_maybe(msg)
+        continue_maybe(msg, True)
 
     continue_maybe(
         "Pick complete (local ref %s). Push to %s?" % (pick_branch_name, PUSH_REMOTE_NAME)