fix(core): Node mocking for evaluation executions (no-changelog)

[burivuhster]

Summary

• Fixed node mocking for evaluation executions (was broken since chore: Switch to the new partial execution logic in test runner (no-changelog) #12140)
• Show mocked nodes as pinned on canvas, when viewing evaluation executions
• Added debug logging for the test runner

Related Linear tickets, Github issues, and Community forum posts

• chore: Switch to the new partial execution logic in test runner (no-changelog) #12140
• https://linear.app/n8n/issue/AI-534/pinning-nodes-doesnt-seem-to-be-working-properly

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...valuation.ee/test-runner/test-runner.service.ee.ts	87.50%	0 Missing and 1 partial ⚠️
packages/cli/src/webhooks/webhook-helpers.ts	0.00%	1 Missing ⚠️
packages/cli/src/workflow-runner.ts	0.00%	1 Missing ⚠️

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