typing: clarify the type of bug_ids as Iterable (Bug 1759890) (#301)

The type of `bug_ids` is `list` but in reality any `Iterable`
will work.

Author: cgsheeh

landoapi/commit_message.py

@@ -5,6 +5,7 @@
 import re
 
 from typing import (
+    Iterable,
     Optional,
 )
 
@@ -202,7 +203,7 @@ def split_title_and_summary(msg: str) -> tuple[str, str]:
     return title, summary
 
 
-def bug_list_to_commit_string(bug_ids: list[str]) -> str:
+def bug_list_to_commit_string(bug_ids: Iterable[str]) -> str:
     """Convert a list of `str` bug IDs to a string for a commit message."""
     if not bug_ids:
         return "No bug"

landoapi/hg.py

@@ -13,7 +13,10 @@
 
 from contextlib import contextmanager
 from pathlib import Path
-from typing import Optional
+from typing import (
+    Iterable,
+    Optional,
+)
 
 import hglib
 
@@ -464,7 +467,7 @@ def format_stack_amend(self) -> Optional[list[str]]:
 
             raise exc
 
-    def format_stack_tip(self, bug_ids: list[str]) -> Optional[list[str]]:
+    def format_stack_tip(self, bug_ids: Iterable[str]) -> Optional[list[str]]:
         """Add an autoformat commit to the top of the patch stack.
 
         Return the commit hash of the autoformat commit as a `str`,
@@ -492,7 +495,9 @@ def format_stack_tip(self, bug_ids: list[str]) -> Optional[list[str]]:
 
             raise exc
 
-    def format_stack(self, stack_size: int, bug_ids: list[str]) -> Optional[list[str]]:
+    def format_stack(
+        self, stack_size: int, bug_ids: Iterable[str]
+    ) -> Optional[list[str]]:
         """Format the patch stack for landing.
 
         Return a list of `str` commit hashes where autoformatting was applied,