Fix tool approval buttons re-enabling during tool execution

What does this MR do and why?

Fix tool approval buttons re-enabling during tool execution

Keep isProcessingToolApproval true while workflow status is RUNNING instead of resetting it when leaving TOOL_CALL_APPROVAL_REQUIRED. This prevents buttons from being clickable while a tool is still executing after user approval.

References

• [Agentic Chat] Tool approval buttons get re-ena... (#583193)

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