[Long-term] Enhance test matrix with multiple Node and OS versions

[Mossaka]

Context

From CI/CD Pipeline Gap Assessment (Discussion #227)

Description

Expand the test matrix to include multiple Node versions (18, 22) and Ubuntu versions to ensure broad compatibility.

Acceptance Criteria

• Add Node.js 18 and 22 to test matrix
• Add multiple Ubuntu versions (20.04, 22.04, latest)
• Ensure tests pass on all matrix combinations
• Document supported versions
• Consider matrix optimization to balance coverage vs CI time

Estimated Effort

To be determined (quarterly goal)

Related

• Discussion CI/CD Pipeline and Integration Tests - Gap Assessment #227