Add hackathon tag to relevant blog entries

[marc1404]

How to categorize this PR?

/kind enhancement discussion

What this PR does / why we need it:

I'd like to add a new hackathon tag to relevant blog entries. I like that the broader community-eventtag includes other activities as well, but I'd also like to have a specific tag to easily find all hackathon entries.

Which issue(s) this PR fixes:

n.a.

Special notes for your reviewer:

/cc @n-boshnakov

I hope I added the new tag to all relevant places 🤞

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📥 Commits

Reviewing files that changed from the base of the PR and between 131d0e1 and 1be98c0.

⛔ Files ignored due to path filters (4)

• website/blog/2024/05/05-21-innovation-unleashed-a-deep-dive-into-the-5th-gardener-community-hackathon.md is excluded by !website/**
• website/blog/2024/12/12-08-unleashing-potential-highlights-from-the-6th-gardener-community-hackathon.md is excluded by !website/**
• website/blog/2025/06/06-17-taking-gardener-to-the-next-level-highlights-from-the-7th-gardener-community-hackathon-in-schelklingen.md is excluded by !website/**
• website/documentation/contribute/documentation/blog-tags.md is excluded by !website/**

📒 Files selected for processing (1)

• hack/apply-blog-tags.mjs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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