fix(dashboard, core): Improve Collection page performance

[biggamesmallworld]

Description

Addresses issue #4010. Attempts to reduce queries on the collections page where we were seeing n+1 queries due to collection breadcrumbs, open collections and collection counts.

Breaking changes

Does this PR include any breaking changes we should be aware of?

Screenshots

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Checklist

📌 Always:

• I have set a clear title
• My PR is small and contains a single feature
• I have checked my own PR

👍 Most of the time:

• I have added or updated test cases
• I have updated the README if needed

[vercel]

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Project	Deployment	Review	Updated (UTC)
docs	Ready	Preview, Comment	Dec 29, 2025 1:29pm
vendure-storybook	Ready	Preview, Comment	Dec 29, 2025 1:29pm

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch VEN-216

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud