fix: Optimize the network module for DKM

[Prekshith-Microsoft]

This pull request refactors the networking and private endpoint architecture in the main infrastructure Bicep template. The changes consolidate the network, Bastion Host, and Jumpbox VM provisioning into a new unified virtualNetwork module and update all dependent modules to reference outputs from this new module. This improves maintainability, clarity, and future extensibility of the deployment. The legacy network.bicep and bastionHost.bicep modules are removed, and all private endpoint subnet references are updated accordingly.

Networking architecture refactor:

• Replaces the legacy network module with a new virtualNetwork module that provisions the Virtual Network, subnets (including for private endpoints, Bastion Host, and Jumpbox VM), NSGs, Bastion Host, and Jumpbox VM in a single place (infra/main.bicep, infra/modules/network.bicep, infra/modules/network/bastionHost.bicep). [1] [2] [3]

Private endpoint subnet references update:

• Updates all modules that create private endpoints (CosmosDB, AppConfig, Storage Account, Search, OpenAI, Document Intelligence) to reference virtualNetwork!.outputs.pepsSubnetResourceId instead of the old network!.outputs.subnetPrivateEndpointsResourceId (infra/main.bicep). [1] [2] [3] [4] [5] [6] [7]

AKS subnet reference update:

• Switches the AKS cluster subnet reference to use the dedicated AKS subnet output from the new virtualNetwork module (infra/main.bicep).

Private DNS zone and output improvements:

• Updates the private DNS zone and output references to use the new virtualNetwork module outputs, and ensures outputs are safely handled if values are missing (infra/main.bicep). [1] [2]

Legacy module cleanup:

• Removes the old network.bicep and bastionHost.bicep modules and their parameters, outputs, and type definitions (infra/modules/network.bicep, infra/modules/network/bastionHost.bicep). [1] [2]## Purpose

• ...

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

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Other Information

[github-actions]

🎉 This PR is included in version 1.2.0 🎉

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