[web-pubsub-client] Fix isDuplicated always returned as true

[zackliu]

Packages impacted by this PR

@azure/web-pubsub-client

Issues associated with this PR

#24901
#24902 try to fix this issue but blocked by format.

Describe the problem that is addressed by this PR

IsDuplicated always return true in WebPubSubResult.

What are the possible designs available to address the problem? If there are more than one possible design, why was the one in this PR chosen?

Are there test cases added in this PR? (If not, why?)

Provide a list of related PRs (if any)

Command used to generate this PR:**(Applicable only to SDK release request PRs)

Checklists

• Added impacted package name to the issue description
• Does this PR needs any fixes in the SDK Generator?** (If so, create an Issue in the Autorest/typescript repository and link it here)
• Added a changelog (if necessary)

[azure-sdk]

API change check

API changes are not detected in this pull request.

[ghost]

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