Tests for heartbeats

[afprtclr]

Tests for heartbeats.
Implementation for https://github.com/Particular/PlatformInternals/issues/776

Reviewer Checklist

• Components are broken down into sensible and maintainable sub-components.
• Styles are scoped to the component using it. If multiple components need to share CSS, then a .css file is created containing the shared CSS and imported into component scoped style sections.
• Naming is consistent with existing code, and adequately describes the component or function being introduced
• Only functions utilizing Vue state or lifecycle hooks are named as composables (i.e. starting with 'use');
• No module-level state is being introduced. If so, request the PR author to move the state to the corresponding Pinia store.

[Copilot]

Copilot review overview

🟢 Approval recommended

The added tests and helpers align with the existing heartbeat components and testing conventions.

Review effort: Balanced
Findings: None

What changed in this PR

Adds comprehensive heartbeat UI tests and reusable test helpers.

Changes:

• Covers heartbeat counts, listing, navigation, sorting, filtering, and refresh behavior.
• Adds reusable actions, queries, and endpoint fixtures.
• Expands configuration sorting coverage.

File	Description
questions/​getListedEndpointNames.ts	Reads listed endpoint names.
questions/​getHeartbeatsTabCount.ts	Reads heartbeat tab counts.
questions/​getEndpointInstanceRows.ts	Reads instance row details.
questions/​getColumnSortDirection.ts	Detects active sort direction.
configuring-heartbeats.spec.ts	Tests configuration sorting.
active-endpoints.spec.ts	Tests active and inactive endpoint workflows.
actions/​sortEndpointsBy.ts	Adds a sorting action.
actions/​navigateToHeartbeatsTabs.ts	Tightens healthy-tab matching.
actions/​navigateToEndpointInstances.ts	Adds instance navigation actions.
preconditions/​hasHeartbeatEndpoints.ts	Adds heartbeat fixture helpers.

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