Resolve "Docs: Clarify Custom Agent tool availability by environment (Web UI vs IDE)"

Andrew Dunnrequested to merge
588974-docs-clarify-custom-agent-tool-availability-by-environment into master

What does this MR do and why?

The Agent Tools page lists 88 tools without indicating environment availability. Added a Tool column to help users locate in source, as well as Web UI and IDE columns indicating availability.

References

Please see #588974

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