Remove vis tool feature flag from configs

[juliawu]

Removes the standardized_vis_tool feature flag from feature flag config .json files.

Context

All remaining code references to the standardized_vis_tool flag have been removed in #6240. That change has hit production in release v23.4.10 and custom DC stable release.

This change completes the deprecation by removing the now-unused feature flag from our feature flag configs.

[gemini-code-assist]

Summary of Changes

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This pull request completes the deprecation process for the 'standardized_vis_tool' feature. Following the removal of all code references to this flag in a previous change, this PR cleans up the remaining configuration entries across all environments to ensure a consistent and clutter-free codebase.

Highlights

• Feature Flag Cleanup: Removed the 'standardized_vis_tool' feature flag from all environment-specific configuration files.

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[gemini-code-assist]

Code Review

This pull request removes the "standardized_vis_tool" feature flag from all environment configuration files, including autopush, custom, dev, local, production, and staging. I have no feedback to provide as there are no review comments.