Add hackathon summary for 2026-03

[marc1404]

How to categorize this PR?

/kind enhancement

What this PR does / why we need it:

Better late than never: This PR adds the hackathon summary for the hackathon at SAP Sofia back in March 2026.

Which issue(s) this PR fixes:

n.a.

Special notes for your reviewer:

/cc @rrhubenov @tobschli
/cc @n-boshnakov @BoHristova

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[gardener-prow]

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[vpnachev]

/lgtm