feat: add ExecChangeset function to runtime

[jkongie]

This updates the ExecChangeset function to return the changeset output instead of the task ID. This is more useful for testing purposes than the task ID.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5739ed9

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[cl-sonarqube-production]

Quality Gate failed

Failed conditions
66.7% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube