fix: Change highlighted fields for decision tasks

[adhityamamallan]

Summary

Problem

Decision task failures are not highlighted in the UI, and are easy to miss.

Solution

• Add reason, failure details, and cause to the list of fields displayed in the event summary for failed/timed out decision tasks.
• Highlight these fields as "negative" to apply red styling
• Remove the startToClose timeout from decision tasks' event summary to reduce visual clutter (it comes from a default configuration anyway, and users should have no reason to change it)
• Hide empty reason/cause fields in the event summary row

Test plan

Updated unit tests + ran locally.

Before

After

Timed out decision task

[Copilot]

Pull request overview

This PR improves the visibility of decision task failures and timeouts in the workflow history UI by adding field highlighting and adjusting which fields are displayed in event summaries.

Changes:

• Added cause field to failed decision task events, and included cause field for timed out decision task events in both negative (red highlighting) and summary field configurations
• Removed startToCloseTimeoutSeconds from scheduled decision task event summaries to reduce visual clutter
• Added comprehensive test coverage for the new field configurations

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
src/views/workflow-history-v2/helpers/get-history-group-from-events/get-decision-group-from-events.ts	Updated field configuration to highlight failure/timeout fields and removed startToCloseTimeout from scheduled event display
src/views/workflow-history-v2/helpers/get-history-group-from-events/tests/get-decision-group-from-events.test.ts	Added tests for new timeout event field configuration and updated existing tests to reflect removed startToCloseTimeout field

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