Building main.json from main.bicep to get latest changes. (#262)

### Description

Building `main.json` from `main.bicep` to get latest changes.

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [Contribution
Guidelines](https://github.com/microsoft/copilot-chat/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/copilot-chat/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

Co-authored-by: Ben Thomas <[email protected]>

Author: alliscode

scripts/deploy/main.json

@@ -5,7 +5,7 @@
     "_generator": {
       "name": "bicep",
       "version": "0.20.4.51522",
-      "templateHash": "1330294935556235998"
+      "templateHash": "6091974935920125454"
     }
   },
   "parameters": {
@@ -102,7 +102,7 @@
     },
     "azureAdInstance": {
       "type": "string",
-      "defaultValue": "https://login.microsoftonline.com",
+      "defaultValue": "[environment().authentication.loginEndpoint]",
       "metadata": {
         "description": "Azure AD cloud instance for authenticating users"
       }