Fix missing priority & weight properties

[simonkurtz-MSFT]

Purpose

• Adds priority & weight properties back to the backend pool after I inadvertently dropped them in this commit.

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code
• Run the backend loadbalancer lab.

What to Check

Verify that the following are valid:

• Observe a distribution of all requests to priority 1 before falling back to a somewhat equal distribution across two priority 2 AOAI backends.

Other Information

Copilot reviewed 2 out of 4 changed files in this pull request and generated no comments.

Files not reviewed (2)

• modules/apim/v1/openai-api.bicep: Language not supported
• modules/cognitive-services/v1/openai.bicep: Language not supported