Remove JsonIgore for usePublicIps

[damondouglas]

This PR fixes #30483. Removing the JsonIgnore annotation restores visibility of the parameter on the console.

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[damondouglas]

R: @Abacn

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[kennknowles]

Just a note to be careful, because it isn't just a visibility issue. It will also cause this pipeline option to govern execution on the worker. Some pipeline options do cause issues unless they are cleared before the worker gets this. This one is probably fine.

[kennknowles]

Incidentally we probably need to add most of our team to the dataflow and runner tag combination to get reviewers.