Multiple Function Apps with same names created successfully in same subscription

[v-amyang]

OS: Win 11
Build Version: 20251211.1

Repro Steps:

1. Create a containerized Function App named ts-funcapp-basic1212 under slow network conditions so the creation is delayed
2. Without waiting for completion, create another Function App with the same name in the same subscription
3. Create a Flex Consumption Function App with the same name ( this is the 3rd attempt)
4. make a 4th attempt to create Basic or Advanced Function Apps with the same name, this time validate works and pops an error requiring a different name
5. Verify the 3 Function Apps with same names are created successfully

Expect:
The second attempt should fail immediately because Function App names must be globally unique

Actual:
Multiple Function Apps with the same name were successfully created in the same subscription and in Azure Portal that 3 Function Apps with the same name were exsit

[MicroFish91]

I don't think we implemented the default hostname work in Functions completely yet, we should double check to see if they're doing something on the service side now to allow duplicate names for apps in the same location