Python: Fix responses agent kernel args bug

[moonbox3]

Motivation and Context

The arguments: KernelArguments are not getting handled properly for the Responses Agent invoke. Use the provided arguments instead of trying to get them from the kwargs.

Description

• Closes Python: Bug Report: Arguments Parameter Ignored in ResponsesAgentThreadActions.invoke() #13053
• Adds unit test coverage.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[moonbox3]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
agents/open_ai
responses_agent_thread_actions.py	437	126	71%	177, 194, 207, 218–219, 227, 234, 247, 407–408, 410, 424, 429, 436, 451–452, 462, 469, 471–472, 481, 488, 490–491, 502, 509, 511–512, 522, 529, 534–535, 539, 551, 585–587, 590, 608–609, 620–622, 626, 630–631, 635–637, 648–650, 672, 674–675, 682–683, 685–686, 688, 690–691, 693–694, 792, 797, 805–806, 808, 814, 819, 824–826, 832–834, 839–840, 842–847, 849, 853–854, 856, 860, 864, 869–870, 875, 878–879, 939–942, 965, 1011–1014, 1055–1056, 1060–1062, 1064, 1089–1090, 1092–1096, 1098, 1108–1109, 1117, 1121, 1128, 1134, 1210
TOTAL	27111	4727	82%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3717	22 💤	0 ❌	0 🔥	1m 37s ⏱️