feat: Define local integration testing strategy

[lornakelly]

Description

Placeholder ticket for work coming from spike #103
TODO: Fill in details after the spike is complete

Motivation

Placeholder ticket for work coming from spike #103
TODO: Fill in details after the spike is complete

Proposed Implementation

No response

Definition of Done

• Implementation: Fully implemented according to the Serverless Workflow spec.
• Unit Tests: Comprehensive unit tests are included and passing.
• Integration Tests: Verified within the monorepo and target environments (Web/VS Code).
• Documentation: Updated README.md, ADRs, or official docs.
• Performance: No significant regression in editor responsiveness.
• Accessibility: UI changes comply with accessibility standards.

[fantonangeli]

Moved to quarkiverse/quarkus-flow#523