Add lastFailureDetails and lastFailureReason to pending event summary

[adhityamamallan]

Summary

• Show lastFailureDetails and lastFailureReason on pending event summary, for a pending event that's retrying
• Render them as negative fields
• Parse lastFailureDetails as JSON
• Fix the unit tests to use exact event metadata index instead of trying to find event metadata based on the label

Test plan

Updated unit tests + ran locally.

[Copilot]

Pull Request Overview

This PR enhances the pending event summary display by adding failure information to help users understand retry attempts. It shows lastFailureReason and lastFailureDetails as negative fields for pending activities that are retrying, and updates the configuration to properly render these fields as JSON.

• Add lastFailureReason and lastFailureDetails to pending activity event configurations
• Update regex patterns to include lastFailureDetails for proper JSON rendering
• Refactor test assertions to use direct array indexing instead of searching by metadata properties

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
get-activity-group-from-events.ts	Add failure fields to pending activity configurations for negative and summary fields
get-activity-group-from-events.test.ts	Update test assertions to use exact array indices instead of metadata searches
workflow-history-event-summary-field-parsers.config.ts	Add lastFailureDetails to JSON field parser regex pattern
workflow-history-event-details.config.ts	Add lastFailureDetails to JSON details renderer regex pattern

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