feat: New history events group for Workflow Signaled events

[adhityamamallan]

Summary

Add new history events group for Workflow Signaled events, separating them from the other single history events.

Key differences:

• The signal name is now part of the event name itself
• Dedicated group type

Other changes:

• Add fixtures
• Update filtering logic to account for new group type

Test plan

Added/updated unit tests + ran locally.

Before

After

With filters applied

[Copilot]

Pull request overview

Adds a dedicated history event group for Workflow Signaled events in Workflow History V2 so they no longer appear as generic single “Event” groups, and so future filtering logic can treat them as a first-class group type.

Changes:

• Introduces WorkflowSignaled as a new HistoryEventGroupType and HistoryEventsGroup variant, plus a dedicated WorkflowSignaledHistoryEvent type.
• Updates the grouping pipeline to detect workflowExecutionSignaledEventAttributes and build a WorkflowSignaled group with a label that includes the signal name.
• Adjusts category filtering logic + fixtures/tests to reflect the new group type and mapping to the SIGNAL filter category.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/views/workflow-history-v2/workflow-history-v2.types.ts	Adds new group/event types for Workflow Signaled events and removes signaled from the single-event union.
src/views/workflow-history-v2/helpers/workflow-history-grouper.ts	Routes signaled events into the new WorkflowSignaled group builder.
src/views/workflow-history-v2/helpers/get-history-group-from-events/get-workflow-signaled-group-from-events.ts	New group builder that generates a signal-name-aware label and metadata mappings.
src/views/workflow-history-v2/helpers/get-history-group-from-events/get-single-event-group-from-events.ts	Removes Workflow Signaled handling from generic single-event labeling/status/summary.
src/views/workflow-history-v2/helpers/check-history-event-group/is-workflow-signaled-event.ts	New type guard for signaled events.
src/views/workflow-history-v2/helpers/check-history-event-group/is-single-event.ts	Removes signaled events from the “single event” classification.
src/views/workflow-history-v2/config/workflow-history-event-group-category-filters.config.ts	Updates SIGNAL/WORKFLOW categorization to rely on the new group type.
src/views/workflow-history-v2/__fixtures__/workflow-history-workflow-signaled-events.ts	Adds fixtures for Workflow Signaled events.
src/views/workflow-history-v2/__fixtures__/workflow-history-single-events.ts	Removes the signaled single-event fixture (now represented by the new fixture).
src/views/workflow-history-v2/__fixtures__/workflow-history-event-groups.ts	Adds a mock WorkflowSignaled group fixture used by tests.
src/views/workflow-history-v2/.../__tests__/*.test.ts (multiple)	Updates/introduces unit tests to validate the new group type, grouping, and filtering behavior.

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