{AKS} Fix aks byo appgw test case

[FumingZhang]

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This checklist is used to make sure that common guidelines for a pull request are followed.

Fix aks byo appgw test case test_aks_byo_appgw_with_ingress_appgw_addon. See sibling PR #22608 in azure-cli.

Related command

network application-gateway create

General Guidelines

• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally?

For new extensions:

• My extension description/summary conforms to the Extension Summary Guidelines.

About Extension Publish

There is a pipeline to automatically build, upload and publish extension wheels.
Once your pull request is merged into main branch, a new pull request will be created to update src/index.json automatically.
The precondition is to put your code inside this repository and upgrade the version in the pull request but do not modify src/index.json.

[FumingZhang]

Queued a pipeline to test this case. The case passed.