feat(rootly): add Get Incident action component

[nenadilic84]

Summary

Implements the Get Incident component for the Rootly integration, which retrieves a single incident by ID.

Closes #2536

What was added

New files:

• pkg/integrations/rootly/get_incident.go - Component implementation following the same pattern as UpdateIncident and CreateIncident
• pkg/integrations/rootly/get_incident_test.go - Unit tests for Setup() and Execute() methods
• pkg/integrations/rootly/example_output_get_incident.json - Example output JSON for the component
• web_src/src/pages/workflowv2/mappers/rootly/get_incident.ts - Frontend mapper for rendering incident details in the workflow UI

Modified files:

• pkg/integrations/rootly/rootly.go - Registered &GetIncident{} in Components()
• pkg/integrations/rootly/example.go - Added embedded JSON, sync.Once, and ExampleOutput() for GetIncident
• web_src/src/pages/workflowv2/mappers/rootly/index.ts - Added getIncident mapper and event state registry entry

Component details

• Name: rootly.getIncident
• Configuration: Single required incidentId field (string)
• Output: Emits on the default output channel with type rootly.incident containing the full incident object
• Uses the existing client.GetIncident() method from client.go

Test plan

• Unit tests pass for Setup() with valid/invalid configurations
• Unit tests pass for Execute() with successful API response
• Unit tests pass for Execute() with API error response
• Component appears in Rootly integration component list
• Frontend mapper correctly renders incident details

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[nenadilic84]

Demo video coming shortly — recording the integration setup and retrieving an incident from Rootly.