fix: Token count reset issue in DKM chat UI and enhance deployment script with tenant-specific login

[Prasanjeet-Microsoft]

Purpose

This PR addresses a UI issue in the DKM chat interface and improves the deployment script to support tenant-specific authentication:

• UI Fix: Token/Character count now resets correctly after each message is sent and a response is received.
• Deployment Update: PowerShell script modified to allow login using a specified tenant ID, improving compatibility in multi-tenant environments

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid:

• Token count resets to 0/500 after sending a message and receiving a response
• Chat functionality works as expected with no UI regressions
• PowerShell deployment runs successfully with tenant-specific login
• No impact on users with default single-tenant login

[github-actions]

🎉 This PR is included in version 1.0.0 🎉

The release is available on GitHub release

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