[autorevert] correctly fetch ghstack commits

[izaitsevfb]

Ghstack commits are nested inside a single push event. Fortunately, the webhook has this information, we just need to unroll the list.

Testing:
2025-10-03T19-16-15.103579-00-00.html

see this stack there:

Tue 10:43 am	5ed4672	[dynamo, 3.14] fix _detect_and_normalize_assert_statement for 3.14 (#164005)	
#164005
williamwen42
Tue 10:43 am	2600f8b	[dynamo, 3.14] fix tracing typing.Union (#164004)	
#164004
williamwen42
Tue 10:42 am	9ce31e4	[3.14] make unbacked_sym[int/float]_counter integers (#163920)	
#163920
williamwen42
Tue 10:42 am	0657de9	[dynamo, 3.14] support LOAD_COMMON_CONSTANT (#163919)	
#163919
williamwen42
Tue 10:42 am	4ead8eb	[dynamo, 3.14] fix BUILD_TUPLE with 0 args (#163818)	
#163818
williamwen42
Tue 10:42 am	d4b785a	[dynamo, 3.14] fix stack ref copy error (#163796)	
#163796
williamwen42
Tue 10:42 am	9278b18	[dynamo, 3.14] fix WITH_EXCEPT_START (#163292)	
#163292
williamwen42
Tue 10:42 am	008b0a9	[dynamo, 3.14] fix inactive ctx handling in resume functions (#163191)	
#163191
williamwen42
Tue 10:42 am	44677ad	[dynamo, 3.14] support LOAD_CONST on slice, codegen LOAD_CONST slice instead of BINARY/STORE_SLICE (#163110)	
#163110
williamwen42
Tue 10:42 am	1c9987f	[dynamo, 3.14] fix context managers (#163109)	
#163109
williamwen42
Tue 10:41 am	7cbc011	[dynamo, 3.14] support some bytecodes, fix CALL_FUNCTION_EX (#163009)	
#163009
williamwen42
Tue 10:41 am	09c7741	[dynamo, 3.14] Python dynamo changes to get basic programs working (#161839)	
#161839
williamwen42
Tue 10:41 am	763ab2a	[dynamo, 3.14] compile actual code in C dynamo (#161555)	
#161555
williamwen42
Tue 10:41 am	4b8fe79	[dynamo] format cpython_defs.c (#161838)	
#161838
williamwen42

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