Test: Disable weighted inference pool backend test in pipeline

[salonichf5]

Proposed changes

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Disable GatewayWeightedAcrossTwoInferencePools tests in pipeline

Testing: Watching the pipeline run to succeed

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Closes #ISSUE

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

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[salonichf5]

will be added as part of Ciara's PR since it is only related to v1.1 for inference extension