fix(utils): add JSON tag for UpdateAuthData in UpdateOptions

[freeznet]

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Motivation

Current impl fails to marshaling the UpdateAuthData to https://github.com/apache/pulsar/blob/master/pulsar-common/src/main/java/org/apache/pulsar/common/functions/UpdateOptionsImpl.java#L36

Modifications

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This change is a trivial rework / code cleanup without any test coverage.

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[Copilot]

Pull request overview

This pull request fixes a marshaling issue by adding a JSON struct tag to the UpdateAuthData field in the UpdateOptions struct. The struct is used when updating functions, sources, and sinks via the Pulsar Admin API, and the JSON tag ensures proper serialization to match the Java implementation's field name updateAuthData.

• Added json:"updateAuthData" tag to the UpdateAuthData field in UpdateOptions struct
• Added comprehensive test coverage for both JSON marshaling and unmarshaling of UpdateOptions

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
pulsaradmin/pkg/utils/update_options.go	Added JSON struct tag to enable proper marshaling of UpdateAuthData field
pulsaradmin/pkg/utils/update_options_test.go	Added new test file with tests for JSON marshaling and unmarshaling of UpdateOptions

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