ciq-cherry-pick.py: Add upstream-diff in the commit message in case of conflict

If the conflict is solved manually, then developer use
```
git commit -F MERGE_MSG
```
Therefore it makes sense to include "upstream-diff |" in the MERGE_MSG.

In case the conflict is solved by cherry picking other commits,
ciq-cherry-pick.py will be called again and MERGE_MSG will be rewritten,
including the "upstream-diff" part.

Signed-off-by: Roxana Nicolescu <rnicolescu@ciq.com>

Author: roxanan1996

ciq-cherry-pick.py

@@ -36,7 +36,7 @@ def check_fixes(sha):
             raise RuntimeError(f"The commit you want to cherry pick references a Fixes {fix}: but this is not here")
 
 
-def manage_commit_message(full_sha, ciq_tags, jira_ticket):
+def manage_commit_message(full_sha, ciq_tags, jira_ticket, commit_succesfull):
     """
     It standardize the commit message by including the ciq_tags, original
     author and the original commit full sha.
@@ -60,7 +60,10 @@ def manage_commit_message(full_sha, ciq_tags, jira_ticket):
     with open(MERGE_MSG, "r") as file:
         original_msg = file.readlines()
 
-    new_msg = CIQ_cherry_pick_commit_standardization(original_msg, full_sha, jira=jira_ticket, tags=ciq_tags)
+    optional_msg = "" if commit_succesfull else "upstream-diff |"
+    new_msg = CIQ_cherry_pick_commit_standardization(
+        original_msg, full_sha, jira=jira_ticket, tags=new_tags, optional_msg=optional_msg
+    )
 
     print(f"Cherry Pick New Message for {full_sha}")
     print(f"\n Original Message located here: {MERGE_MSG_BAK}")
@@ -90,12 +93,15 @@ def cherry_pick(sha, ciq_tags, jira_ticket):
 
     # Commit message is in MERGE_MSG
     git_res = subprocess.run(["git", "cherry-pick", "-nsx", full_sha])
-    manage_commit_message(full_sha=full_sha, ciq_tags=ciq_tags, jira_ticket=jira_ticket)
+    commit_succesfull = True if git_res.returncode == 0 else False
+    manage_commit_message(
+        full_sha=full_sha, ciq_tags=ciq_tags, jira_ticket=jira_ticket, commit_succesfull=commit_succesfull
+    )
 
-    if git_res.returncode != 0:
+    if not commit_succesfull:
         error_str = (
             f"[FAILED] git cherry-pick -nsx {full_sha}\n"
-            "Manually resolve conflict and include `upstream-diff` tag in commit message\n"
+            "Manually resolve conflict and add explanation under `upstream-diff` tag in commit message\n"
             f"Subprocess Call: {git_res}"
         )
         raise RuntimeError(error_str)