Feat/service account prompting

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Summary

Brief description of what this PR does and why.

Fixes #(issue)

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Other: ___________

Testing

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Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
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@BugBot review

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PR Summary

Medium Risk
Changes credential requirement metadata used by Copilot/tooling and alters subblock visibility logic via a new shared reactive-conditions hook, which could affect what configuration fields are shown or what auth prompts are generated.

Overview
Adds a shared useReactiveConditions hook and wires it into both the editor subblock layout and canvas WorkflowBlock rendering so subblocks can be dynamically hidden based on watched field values (e.g., selected credential type).

Updates Copilot get_blocks_metadata transformation to derive the OAuth service from the oauth-input subblock’s serviceId (instead of the block id) and to additionally advertise service-account support via requiredCredentials.serviceAccountType when available.

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