[BUG] availabilityZones() function for class ApplicationGatewayImpl class throw an exception

[rnizhar-te]

Describe the bug
calling the function: applicationGateway.availabilityZones() when application gateway has availability zones returns this error:

class com.azure.resourcemanager.resources.fluentcore.arm.AvailabilityZoneId cannot be cast to class java.lang.Comparable (com.azure.resourcemanager.resources.fluentcore.arm.AvailabilityZoneId is in unnamed module of loader 'app'; java.lang.Comparable is in module java.base of loader 'bootstrap').

The reason for this exception is that you try to add elements to tree set that do not implement Comparable interface

Exception or Stack Trace
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To Reproduce
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Code Snippet
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Expected behavior
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Setup (please complete the following information):

• OS: [e.g. iOS]
• IDE: [e.g. IntelliJ]
• Library/Libraries: [e.g. com.azure:azure-core:1.16.0 (groupId:artifactId:version)]
• Java version: [e.g. 8]
• App Server/Environment: [e.g. Tomcat, WildFly, Azure Function, Apache Spark, Databricks, IDE plugin or anything special]
• Frameworks: [e.g. Spring Boot, Micronaut, Quarkus, etc]

If you suspect a dependency version mismatch (e.g. you see NoClassDefFoundError, NoSuchMethodError or similar), please check out Troubleshoot dependency version conflict article first. If it doesn't provide solution for the problem, please provide:

• verbose dependency tree (mvn dependency:tree -Dverbose)
• exception message, full stack trace, and any available logs

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