Python: Removed usage of DefaultAzureCredential

[dmytrostruk]

Motivation and Context

The usage of DefaultAzureCredential by default is unsafe and raises security issues. Instead, users should provide their own credential types such as AzureCliCredential, ManagedIdentityCredential and so on. More information here:
https://learn.microsoft.com/en-us/python/api/azure-identity/azure.identity.aio?view=azure-python

In this PR:

1. Removed the usage of DefaultAzureCredential from authentication logic.
2. Replaced DefaultAzureCredential with AzureCliCredential in all examples.

Note: this is breaking change for Azure users, who relies on DefaultAzureCredential. Users will need to update the code and pass the credential type of their choice by using credential parameter when initializing one of the Azure clients.

Before:

chat_completion = AzureChatCompletion()

After:

chat_completion = AzureChatCompletion(credential=AzureCliCredential())

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
kernel.py	228	58	74%	148, 159, 163, 313–314, 316, 398, 404–405, 409–410, 463–467, 469–470, 483–492, 494, 496–497, 499–519, 521–526
agents/azure_ai
azure_ai_agent.py	362	180	50%	99, 101–104, 106–108, 110–115, 117, 119, 121–123, 125, 142, 144–147, 149–154, 156, 161–162, 167–170, 175–179, 181–184, 186–192, 197, 199–202, 204–206, 208–211, 213, 215, 225–226, 228–231, 233–234, 239, 241–247, 249, 282, 293–294, 299–300, 303, 308–313, 320–321, 323, 328–329, 340–346, 398, 400, 406, 417, 420, 422, 424, 426, 460, 491–493, 495, 497–498, 500–503, 506–508, 510–511, 514, 517–526, 528, 537–538, 541–543, 545–546, 556–557, 559, 577, 579, 582, 584–585, 587–588, 590, 599–600, 602, 604–607, 610, 612, 615–617, 621, 690, 796, 900, 973
agents/open_ai
azure_assistant_agent.py	90	25	72%	35, 108, 112, 180–181, 191–192, 194, 201, 204–205, 209–214, 216–217, 219–220, 222, 252, 272, 282
azure_responses_agent.py	92	61	33%	39, 94–95, 105–106, 108, 115, 118–119, 123–128, 130–131, 133–134, 136, 146, 187–188, 198–199, 201, 208, 211–212, 216–221, 223–224, 226–227, 229, 248, 250, 253, 255–256, 258–259, 261, 271–272, 274, 276–279, 282, 284, 287–289, 293
connectors
azure_cosmos_db.py	403	167	58%	182, 199, 205–207, 317, 319, 394, 398, 414–417, 419–422, 424–425, 438–441, 444–446, 452–453, 455, 462–464, 468–470, 493–495, 501–503, 509–510, 512, 517, 534, 609, 626, 629–630, 638, 648–652, 709, 712–713, 750, 752, 765–766, 770–772, 783–786, 789–790, 792–793, 798–802, 805–808, 810–815, 817–818, 825–830, 849–851, 853–856, 864, 871–876, 878–892, 894–905, 908, 910–911, 914–915, 918, 920–925, 931, 935, 959, 987–988, 992–997, 1089–1094
sql_server.py	507	90	82%	152, 258, 352–354, 374, 393, 404, 406, 429, 475–478, 494, 506–509, 531, 533, 577–583, 589–590, 592–593, 597–611, 614–619, 622–626, 631, 637–638, 641, 647–648, 650–653, 796, 815–817, 823, 829, 834, 839–842, 848, 882, 924, 931–933, 1099–1100, 1102, 1104, 1125
connectors/ai/azure_ai_inference/services
azure_ai_inference_base.py	46	3	93%	98–99, 101
connectors/ai/open_ai/services
azure_audio_to_text.py	24	0	100%
azure_chat_completion.py	81	0	100%
azure_config_base.py	59	4	93%	82, 98, 100, 112
azure_realtime.py	61	29	52%	104–105, 115–119, 140, 212–213, 223–230, 250, 255, 259–260, 267, 278–283
azure_text_completion.py	25	0	100%
azure_text_embedding.py	27	0	100%
azure_text_to_audio.py	24	0	100%
azure_text_to_image.py	24	0	100%
connectors/ai/open_ai/settings
azure_open_ai_settings.py	30	6	80%	130–135
core_plugins/sessions_python_tool
sessions_python_plugin.py	135	8	94%	71, 86, 88–89, 91, 93, 95, 103
sessions_python_settings.py	42	6	85%	88–93
utils/authentication
entra_id_authentication.py	14	8	42%	26–27, 31–35, 37
TOTAL	26898	4646	82%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3682	22 💤	0 ❌	0 🔥	1m 37s ⏱️