chore: Add new table for test metrics (no-changelog)

[burivuhster]

Summary

This is a part of a TestRunner framework for workflow evaluation. Metric is just a property name to look for in the output of evaluation workflow.

Related Linear tickets, Github issues, and Community forum posts

• https://linear.app/n8n/issue/AI-432/[db]-metric

• 11832

• 11757

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[bot]]

Codecov Report

Attention: Patch coverage is 56.25000% with 7 lines in your changes missing coverage. Please review.	Files with missing lines	Patch %	Lines
...atabases/repositories/test-metric.repository.ee.ts	0.00%	6 Missing :warning:
...kages/cli/src/databases/entities/test-metric.ee.ts	85.71%	0 Missing and 1 partial :warning:

:loudspeaker: Thoughts on this report? Let us know!

[cypress[bot]]

n8n    Run #8060

Run Properties:   Passed #8060  •  e5dfae9e77: 🌳 🖥️ browsers:node18.12.0-chrome107 🤖 burivuhster 🗃️ e2e/*

Project	n8n
Branch Review	ai-432-db-metric
Run status	Passed #8060
Run duration	04m 45s
Commit	e5dfae9e77: 🌳 🖥️ browsers:node18.12.0-chrome107 🤖 burivuhster 🗃️ e2e/*
Committer	Eugene Molodkin
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	1
Pending	0
Skipped	0
Passing	478
View all changes introduced in this branch ↗︎

[github-actions[bot]]

:white_check_mark: All Cypress E2E specs passed