Feature/speech managed identity

[Xeelee33]

Feature - Speech-to-text functionality should now work natively in MAG and sovereign clouds
Based on the below documentation, the Fast Transcription API utilized by Simple Chat for speech-to-text transcription is not available in MAG or other sovereign clouds. For those clouds, I added conditional logic to use the Speech SDK instead.

• https://learn.microsoft.com/en-us/azure/ai-services/speech-service/regions?tabs=stt
• https://learn.microsoft.com/en-us/azure/ai-services/speech-service/sovereign-clouds

Feature - Added Managed Identity authentication option to Speech Service Settings via drop down
Current Speech Service Settings

Updated Speech Service Settings
Added dropdown selection

API Key

Managed Identity

Managed Identity is configured to work with both the Fast Transcription API in commercial and Speech SDK in MAG and other sovereign & custom clouds.

Feature - Updated Speech Settings in Setup Walkthrough
Changed the required "Key" element to Authentication. If using Key-based auth, a Key will be required, if using Managed Identity auth, the condition will be automatically satisfied.

• Note, additional work needed so when settings are saved the setup walkthrough doesn't start over from the beginning

Current

Updated
With Managed Identity selected

With API Key selected, but no Key entered

Feature/Bugfix - Setup Walkthrough Navigation
The Next and Previous buttons in the App Settings Setup Walkthrough were not working correctly. Updated the navigation settings and also updated/corrected the notes and tooltips.

Doc Updates
Rewrote docs\admin_configuration.md to be current and more comprehensive
Updated docs\setup_instructions_special.md with corrected roles needed for managed identity configuration