fix: Event Grid MI issue

[Vamshi-Microsoft]

Purpose

This pull request implements a durable fix for the Event Grid system-topic subscription and role-assignment ordering issue (BUG-0061) in the Bicep infrastructure code, ensuring that role assignments are created before event subscriptions to prevent authorization errors during provisioning. It also applies consistent formatting improvements and minor refactors across the Bicep file for readability and maintainability.

Event Grid and Role Assignment Ordering Fix:

• Refactored the Event Grid system-topic wiring in main.bicep so that the role assignment (eventGridQueueSenderRole) is created before the event subscription (newEventGridSubscription), breaking the chicken-and-egg problem that caused managed identity authorization failures on fresh azd up. The subscription is now a standalone resource that depends on the role assignment, matching the pattern used for existing topics. [1] [2]

Formatting and Readability Improvements:

• Reformatted several multi-parameter and ternary expressions for clarity, including resource property assignments, conditional variable assignments, and module parameters throughout main.bicep. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18]

Documentation Updates:

• Added a detailed worklog entry (worklog/2026-06-23.md) documenting the fix, rationale, and next steps for verifying the Event Grid provisioning flow.
• Updated the bug documentation in bugs.md to reflect the applied durable fix and lessons learned.

These changes ensure the infrastructure provisioning is reliable and idempotent, preventing manual intervention and improving maintainability.

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

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